Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

An acoustic anomaly with a mysterious cause.

This free, take-a-book shop seems like a trick but isn't.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

A wunderkammer hidden on the top floor of the Hartford statehouse.

This curio museum seems like the type of place you might find a mogwai or a monkey's paw.

This psychedelic tourist trap is a leisurely descent into madness.

An emporium for the weird, creepy, rare, and just plain gross.

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

To literally keep their waste out of their own backyards, the citizens of this English city built an impressive sewer system that is still in use today.

Climb right into the heart of this colorful Iceland volcano.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

A gargantuan crystal kingdom.

Sulphuric gases inhabit a beautiful Japanese island.