Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

This sublime architectural marvel is a rare example of an expressionist church.

Hundreds of pieces of ancient Taíno art cover the walls of this Caribbean cave system.

Explore the rich history of Colombia's Indigenous peoples.

A museum built around a bus-sized fossil on the side of the highway.

This collection of ancient, mountaintop, underground tombs was once hidden by decades of bloodshed.

At this beautifully preserved Pre-Hispanic site, you can see ancient petroglyphs with depictions of llamas and alpacas.

This museum covers 10,000 years of Pre-Columbian Latin American history.

The ruins of a pre-Columbian fortress city so secure it held off the Spanish conquistadors for over 20 years.

One of the largest ancient geoglyphs in the world is a tall desert god used for predicting the weather.

What was once a unique system of urban elevators is turning into a mechanical ruin.

This ruined castle perched atop a rocky peak is a great place for a hike.

The 14th-century ruins are said to contain healing powers.

The mystery of the Putim Ossuary involves a tricorn hat.

Mysterious painted skulls in Moravia.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

These 17th-century mummies are no longer naturally preserved, but remain on display today.

Mummified monks and the accidentally interred, in a 17th-century crypt.

A spiral staircase twists to the top of this unusual Czech lookout tower.

Europe's second largest ossuary wasn't discovered until 2001.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A church of bones, decorated with 40,000 human skeletons.

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