"The Donut" was built as part of an expensive, ill-fated engineering endeavor.

Quaint, disturbing, and macabre objects are all on display at this intriguing collection of medical instruments from bygone eras.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

What was once England's second-richest abbey is now a haunting ruin.

A stone copper was sculpted on the wall of the Carlisle Cathedral to honor a local hero.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

This home on a quiet suburban street is completely covered with vibrant mosaics.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

Pop culture has helped to keep this iconic British building from being destroyed.

Eclectic final resting place of the controversial explorer.

The remains of Crystal Palace Great Exhibition of 1851.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

A mysterious artist-run cabinet of curiosities and library.

Remnants of a Victorian garden feature sitting in public woodland.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

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

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

A kaleidoscopic warehouse-maze of handmade neon signs.

Scotland's only funicular railway is also the United Kingdom's highest.