The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

A collection of over 15,000 zines works to preserve DIY publishing culture.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

The childhood home of Henry Jones Jr. is now an adventure-themed bed and breakfast.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

Rather than a run-of-the-mill franchise hotel, this lodging has been decked out in dinosaur decor.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

A little-known hot spring haven right below the highway.

Abandoned silver mine strewn with wrecked and twisted structures.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

Once the path of a railway tunnel, now home to thousands of glowing insects.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

Australian Lake set aglow by Noctiluca Scintillans.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

An Australian lake whose pink hue defies scientific explanation.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

The highest bridge in America was built for an almost unnervingly small amount of money.