A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

The wilderness of northern Sweden is full of shelters to protect people from sounding rockets returning from space.

This magnificent 18th-century hall consists of a maze of nearly a thousand interconnected passages.

Inside the dome of this gigantic, Saturn-shaped building is one of the largest planetariums in Asia.

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

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

The best place in New York to pick up the controversial, notoriously foul-smelling Asian "king of fruits."

A whimsical sensor instrument for Minneapolitans to play on their walks to work.

An institution dedicated to curiosity, logic, riddles, and Mongolia's long history of puzzles.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

A local dialect born in the late 19th century is only spoken in this isolated California valley.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

When struck, the strange stones in this park ring like bells.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Eyam took steps to quarantine themselves and keep the plague from spreading.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.

Extensive private collection of authentic Medieval devices used for human torture and execution.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.