No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

Every equinox this Maya pyramid puts on a spooky ancient light show.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.

World's most expensive home.

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

A saintly relic hidden in a Prague church basement.

Monument to a suicide protesting the Soviet invasion.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

The first museum in the world devoted to sexual gadgetry.

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

Two stunning 17th-century libraries and a cabinet of curiosities.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Looming communist pillar with a Czech twist.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Steadily reminding Czechia of its past.

A mocking tribute to the past and modern leadership of Prague.

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

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

Surprisingly Delicious Asian-Style Hot Dogs.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

Traditional 15th century Chinese garden in the middle of Vancouver.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.