Riften

Capital of the Rift, in the far south-east. Most of the Thieves Guild questline starts here.

City in The Rift
Shown on the world map

Quests here

A Cornered Rat: Speak to Delphine in Riverwood after Diplomatic Immunity; she wants Esbern found.
A Chance Arrangement: Brynjolf approaches you in Riften's market by day, or find him in the Bee and Barb at night. Reward: Gold, and an invitation to the Ragged Flagon.
Taking Care of Business: Find Brynjolf in the Ragged Flagon, at the far end of the Ratway under Riften. Reward: Membership of the Thieves Guild and its armor.
The Pursuit: Meet Karliah at the Ragged Flagon once Enthir has translated the journal. Reward: Chillrend, from a case in the manor's cellar.
Under New Management: Finish Darkness Returns and all four city jobs for Delvin, then speak to Brynjolf. Reward: Guild Master's Armor, the Amulet of Articulation and the key to the tribute chest.
No Stone Unturned: Pick up any Unusual Gem, have Maul or Vex appraise it, then join the guild. Reward: Prowler's Profit: far more gems in every chest and urn.
The Litany of Larceny: Sell Delvin Mallory the first rare trophy you bring back from a guild quest. Reward: Gold for each trophy.
Moon Sugar Rush: Ask Tonilia in the Ragged Flagon for work after Loud and Clear. Reward: Ri'saad's caravan as a travelling fence.
The Numbers Job: Ask Delvin Mallory for extra work. Reward: Gold.
The Fishing Job: Ask Delvin Mallory for extra work. Reward: Gold.
The Bedlam Job: Ask Delvin Mallory for extra work. Reward: Gold.
The Burglary Job: Ask Vex for extra work. Reward: Gold.
The Shill Job: Ask Vex for extra work. Reward: Gold.
The Sweep Job: Ask Vex for extra work. Reward: Gold.
The Heist Job: Ask Vex for extra work. Reward: Gold.
The Book of Love: Speak to Dinya Balu at the Temple of Mara in Riften and ask about Mara's blessings. Reward: Agent of Mara: 15% resistance to magic.
Promises to Keep: Speak to Louis Letrush at the Bee and Barb in Riften. Reward: Levelled gold, or Frost himself if you talk your way into keeping him.
Unfathomable Depths: From level 14, a frightened Argonian on the Riften docks presses a Dwemer lexicon on you. Reward: The ability Ancient Knowledge: a bonus in Dwarven armour and faster Smithing gains.
Grimsever's Return: Talk to Mjoll the Lioness in Riften about her adventuring days. Reward: Mjoll becomes a follower and can be married.
Ringmaker: Speak to the jeweller Madesi at his stall in Riften's market.
Few and Far Between: Speak to Ingun Black-Briar at Elgrim's Elixirs in Riften. Reward: The key to her chest of alchemy supplies, which refills.
Under the Table: Speak to Romlyn Dreth at the Black-Briar Meadery in Riften.
Special Delivery: Speak to Bolli at the Riften Fishery.
Truth Ore Consequences: Speak to Hafjorg at Elgrim's Elixirs in Riften.
Distant Memories: Talk to the trader Brand-Shei in Riften's market about where he came from. Reward: The key to his strongbox.
Caught Red Handed: Speak to Svana Far-Shield at Haelga's Bunkhouse in Riften.
Helping Hand: Speak to the Argonian Wujeeta at the Riften Fishery or in Haelga's Bunkhouse.
The Raid: After Helping Hand, press Wujeeta for the name of her dealer and take it to Jarl Laila Law-Giver.
Supply and Demand: Follows The Raid: show the Jarl of Riften the note from the warehouse.
Pilgrimage: Speak to the priestess Alessandra in Riften's Hall of the Dead.
Ice Cold: Speak to Marise Aravel at her meat stall in Riften's market.
Bring It!: Speak to the Jarl's son Harrald in Mistveil Keep. Reward: Two levelled gems.
Hunt and Gather: Speak to the court wizard Wylandriah in Mistveil Keep.
Stabilized: Speak to the stable hand Shadr outside the gates of Riften.
The Lover's Requital: Speak to Sibbi Black-Briar in his cell in the Riften jail.
Bloody Nose: Talk to Hofgrir Horse-Crusher at the Riften stables and take his bet. Reward: 100 gold.
Spread the Love: Speak to the priestess Dinya Balu in the Temple of Mara after The Book of Love.
Sealing the Deal: Speak to Talen-Jei at the Bee and Barb in Riften.
Stoking the Flames: Speak to the smith Balimund at the Scorched Hammer in Riften.
The Bonds of Matrimony: Ask Maramal about marriage, at the Bee and Barb or the Temple of Mara in Riften. Reward: The Bond of Matrimony and a spouse.

Collectibles here

Thieves Guild Armor – Light armor: Handed out by Tonilia in the Ragged Flagon when you join the Guild in Taking Care of Business. She improves one piece of your choice after Scoundrel's Folly.
Thieves Guild Boots – Light armor: Handed out by Tonilia in the Ragged Flagon when you join the Guild in Taking Care of Business. She improves one piece of your choice after Scoundrel's Folly.
Thieves Guild Gloves – Light armor: Handed out by Tonilia in the Ragged Flagon when you join the Guild in Taking Care of Business. She improves one piece of your choice after Scoundrel's Folly.
Thieves Guild Hood – Light armor: Handed out by Tonilia in the Ragged Flagon when you join the Guild in Taking Care of Business. She improves one piece of your choice after Scoundrel's Folly.
Guild Master's Armor – Light armor: Part of the reward for becoming Guild Master in Under New Management.
Guild Master's Boots – Light armor: Part of the reward for becoming Guild Master in Under New Management.
Guild Master's Gloves – Light armor: Part of the reward for becoming Guild Master in Under New Management.
Guild Master's Hood – Light armor: Part of the reward for becoming Guild Master in Under New Management.
Gloves of the Pugilist – Light armor: Worn by Gian the Fist, a brawler lurking in the Ratway under Riften.
Stone of Barenziah: Mistveil Keep – The Rift: On the bedside table left of the bed in the Jarl's chambers: upstairs and through the locked middle door.
Bust of the Gray Fox: On a table in Riftweald Manor, Mercer Frey's house in Riften, during The Pursuit.
Exquisite Sapphire (Dragonborn) – Curio: Sapphire's thanks when you bring her Glover Mallory's letter from his cellar in Raven Rock, after Paid in Full.
Amulet of Articulation – Amulet: Given by Brynjolf when you become Guild Master in Under New Management.
The Bond of Matrimony – Ring: Given by Maramal at the Temple of Mara in Riften when you marry.
Amulet of Mara – Amulet: Sold by Maramal in Riften for 200 gold, and lent by Dinya Balu for The Book of Love. Copies turn up in random loot and at general traders and jewellers.
Beggar – Pickpocket: Upstairs in Haelga's Bunkhouse in Riften, in the room by the bridge in the Ratway and at Ironback Hideout.
Chillrend – Sword: In a display case behind an expert lock in the cellar of Riftweald Manor, Mercer Frey's house in Riften, reached during The Pursuit.
Nightingale Blade – Sword: Karliah's own sword, given to you during the Thieves Guild quest Hard Answers.