A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

A market for witches is hidden within a train station.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

Massive sinkholes on a mountain in one of the most remote places in Venezuela.

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

Just a man taking his prehistoric pet for a stroll.

At this Oaxaca contest, artists turn purple produce into stunning depictions of saints, buildings, and La Pietà.

Thousands of Haitians travel to the waterfalls to ask the Virgin Mary of Mount Carmel and her voodoo counterpart Erzulie for healing in a yearly pilgrimage.

The world's only museum devoted to the wonders of fluorescence.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

Once housed in the towers of this Gothic church, this 17th century clock still ticks today.

A former plague hospital turned medical museum.

A curious collection dedicated to human and animal anatomy and pathology.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

This basement museum explores the art and artistry of fascism.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A museum of carnival attractions where you are invited to ride the rides.

Weird wax anatomical models reside here, as do other anatomical specimens.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

A curious collection of locks and keys.

A magical, macabre wax museum, beloved by locals, uses real artifacts to depict an assassination from the French Revolution.