Answer: Bangkok

Tourists may call it Bangkok, the locals might call it Bangkok, but the full ceremonial name of the city of Bangkok is actually, when written in anglicized Pali/Sanskrit:

Krungthepmahanakhon Amonrattanakosin Mahintharayutthaya Mahadilokphop Noppharatratchathaniburirom Udomratchaniwetmahasathan Amonphimanawatansathit Sakkathattiyawitsanukamprasit

When translated into English, Bangkok’s full name is:

City of angels, great city of immortals, magnificent city of the nine gems, seat of the king, city of royal palaces, home of gods incarnate, erected by Vishvakarman at Indra’s behest.

While the ceremonial name is proudly displayed in places like city hall and on official stationary, it’s a bit more than a mouthful for casual conversation and the tourism industry, so Bangkok it is.