An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

A blooming house of worship for the masses.

A startling, centuries-old subterranean marvel hides in plain sight.

An ancient iron pillar in Delhi that seems to be rustproof.

On the grounds of the famous Qutab Minar lies another unfinished tower meant to be twice as tall.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

The cursed island of black pebbles.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

The stunning interior of this Gothic church is covered in ornate gold details.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The world's largest wooden structure.

Spain's largest bullring offers a unique glimpse at architecture and history.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Single runway interrupted by a busy road that cuts across its middle.

This 19th-century zoological collection has withstood the test of time.

Climb inside an iron crystal magnified 165 billion times its normal size.

This cannonball has been lodged in the church wall since a 1695 bombardment destroyed the city center.

This automated sculpture of two men peeing will spell out text messages with their micturition.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A surreal statue honoring Prague's favorite literary son.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.