A natural swimming hole that was once a ceremonial center for Mayan priests.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

A devastated ruin in the south of Belize where British explorers claimed to unearth the Mitchell-Hedges Crystal Skull.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

This mysterious hill seems to pull objects uphill.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

The building is topped by a Statue of Liberty statue whose torch has stayed burning since the museum opened.

A modern-day wunderkammer dedicated to Indianapolis history, Afrofuturism, and musical vibrations.

The largest historic preservation organization in the United States.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

This stately clubhouse has showcased German-American culture for over a century.

A monument to the King's final show, complete with a time capsule.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

This Indianapolis landmark offers a secret panoramic view of the city. 

A medical facility that has been kept frozen in time.

The "Prussian Versailles" that is as glorious today as when it was built.

If you visit the burial place of King Frederick the Great, you'll likely find a couple of potatoes sitting on his tombstone.

A quaint Russian village in the middle of a German metropolis.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

This concrete residential area doubles as an open-air gallery.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

A dilapidated space station with overtones of 'Alien' and 'Bladerunner' featuring a multiplayer games galore.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

A prime example of socialist modernist architecture, wrapped in a enormous fresco about the media.