A marvel of Byzantine engineering under the streets of Istanbul.

Skyscraper powered by wind turbines attached between its towers.

This beautifully historic Bahrain fortress might not be the most popular attraction around, but that might make it all the better.

This centuries-old tree tells an unusual tale of vegetation and fertility in the desert.

A small museum in the Bay of Pigs gives the Cuban perspective on the famously failed U.S. invasion.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

A Sri Lankan tea factory's ironic take on the Los Angeles landmark.

This ancient cave temple complex is the largest and best-preserved temple complex in Sri Lanka.

This amazing mountain temple is topped by one of the tallest sitting Buddha statues in the world.

This elaborate temple was built around one of the Buddha's teeth.

An ancient stone fortress considered by many to be the eighth wonder of the world.

Singapore's oldest Hindu temple.

The busy transport hub is home to the tallest airport slide in the world.

This $62 million dollar temple was erected to house one little dental fragment of religious history.

Singapore's landscaping project is home to 18 incredible Supertrees.

The exorbitant price of paradise.

The last remaining colonial-era Italian church in Old Goa.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

The evocative ruins of a 1,000-year-old hill fort lie within a popular tiger reserve.

The world's second-largest sundial, made entirely out of stone.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.