The 1,400-year-old underground reservoir in Istanbul

Open year-round, the cistern draws thousands of tourists annually. Admission is €25 (US$26).

Visitors can fly directly to Istanbul from Hanoi or Ho Chi Minh City with Turkish Airlines, a journey of about 11 hours.

Passengers with layovers exceeding six hours can take advantage of the airline’s free city tours, which include guided visits to Istanbul’s landmarks and complimentary meals. Additionally, Turkish Airlines offers free overnight stays at four-star hotels for economy passengers and two-night stays at five-star hotels for business class passengers.

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