Once the home of a hermetic monk, this cave now houses a small church.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

This massive subterranean fissure is known as the "underground Grand Canyon."

This South London cemetery holds the remains of more than 15,000 people.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A naturally beautiful, seemingly bottomless deep blue spring.

If your school was decorated with trippy graffiti, served ambrosial coffee, and was frequented by mimes, it might have been similar to this groovy cafe.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

A giant scrawl on the skyline of south London.

A domino effect created with Britain’s iconic telephone boxes.

London's first edible insect farm offers facility tours and cooking classes.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

Artists and musicians now rule over this former rail station.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

A little slice of Japan and its aesthetics in London's Holland Park.

Abstract dinosaur models in London.

This hidden green space is the city's second largest conservatory.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

The ghosts of Britain's telecommunication past sit rusting away in a small village in England.