Hidden by the roadside in the Iya Valley, this gem brings together folk monsters and the region's unique geography.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

This unique temple complex remains off the typical tourist trail.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This beautiful and unmissable little museum is full of fascinating artifacts from Mesoamerica's great civilizations.

The final resting place for the remains of 143 Habsburg royalty.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The world’s largest Masonic temple was saved by the White Stripes.

An abandoned Byzantine fortress and notorious prison.

The oldest operating pharmacy in the world features 800-year-old recipes.

The history of the traveling carnival is remembered by this sprawling collection of vintage wagons, games, and rides.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

One man's quest to collect artifacts from every aspect of human life has resulted in this eclectic Argentinian museum.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

It's always summer at the beach inside this former airship hangar.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

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