The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

Tens of thousands of rocks make up what is thought to be a giant star calendar.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.

On the Oregon coast there is a natural hole that seems to be draining the sea.

This Russian locomotive museum was once devoted just to Lenin's funeral before expanding to encompass Moscow's entire train history.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

The world's first and only escalator for lazy bicycles and their daunted riders.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

Now home to nothing but a weather station and a landing strip, a group of enslaved people were marooned on this tiny island for 15 years.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

These warring psychedelic crags commemorate an unsuccessful military operation.

This former steel and coal plant is now a neon-lit industrial fantasia.

Boats must transform into railroad cars to navigate this Polish canal.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.