This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

A giant, bloody battle rages throughout the Bolivian Andes each year.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This geothermal hot spring hides beneath a slowly growing mineral dome.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This Cambodian riverbed is covered in ancient Hindu carvings both above and below the waters.

Crawling into this primordial cave may feel disconcertingly familiar.

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.

This frequently-photographed waterfall takes only a short hike to visit.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A grand imperial capital left to fall into magnificent ruin.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A winding, cliffside stretch of road overlooking the Delaware River.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

The true depths of these stunning Moroccan caves are unknown.

The world's largest reflecting pool is just two centimeters deep.

This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

The world's northernmost ice hotel.

This disappearing geyser has been attributed to witchcraft, but really it's all about rainfall.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.