See also: 10 amazing forgotten classic cocktails and where to try them in Bangkok

Track 17

Decked out like a 1920s train cabin, Track 17 offers a real deal cocktail list created by Ronnaporn “Neung” Kanivichaporn (2014 Thailand World Class Bartender and co-founder and mixologist at Rood Hideaway). The menu focuses mainly on 20th-century classics to go with the decor, but also expect some even rarer finds like Rosita (a twist of Negroni using tequila instead of gin), Bobby Burns and Hanky Panky.     
The Commons, 355 Thonglor Soi 17, 02-101-4525. Open 6pm-midnight   

The Speakeasy

This rooftop cocktail lounge takes you back to the jazz age. The two-story space sports prohibition-era inspired decor, featuring lots of dark woods and Art Deco touches. A balcony on the 24th floor lets you take in 180-degree views of Bangkok’s business district, while an al fresco rooftop offers a more leisurely atmosphere. Try classic cocktails that focus specially on forgotten classics like Sazerac and Brandy Crusta. 
24-25/F, Hotel Muse Bangkok, 55/555 Lang Suan Rd., 02-630-4000. Open daily 6pm-1am

Il Fumo

Husband-and-wife restaurateurs Choti Leenutaphong and Debby Tang of Vesper Cocktail Bar & Restaurant have enlisted their Soi Convent cocktail institution’s team to create a drinks list even more traditional than Vesper’s. Headed by Pailin Sajjanit (2015’s Diageo World Class Thailand’s Finalist), the bar fixes forgotten oldies like a Boulevardier with the addition of a smoky mezcal (The Smoking Bulleit, B620), a whiskey sour with Chartreuse as per the original 1870s formula (Daisy, B420) and a Martinez with their own house-made gin (B420). 
1098/2 Rama 4 Rd., 02-286-8833. Open Mon-Sat 6pm-1am