A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

An original apothecary from 1792.

An astounding collection of medical specimens, including bits of President Lincoln.

Explore the subjective dream of a hotel.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

A semi-scholarly approach to sex.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

A decommissioned military complex that's now a modern industrial park.

Ride the subways of yesteryear.

A veritable variety of odds and ends.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

An enormous, 30-story-deep hole in the middle of Guatemala City.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

A charming flea market shop dedicated to retrofuturistic apparati.

Statue of death tucked in the University of Medicine courtyard.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.