A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

A baffling beast so absurd a town councilman called it "intellectual vomit in technicolor."

A bright little alley in La Boca is a part of tango history.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A perilous medieval road leading right into the sea.

A local tree surgeon has created a whimsical walk full of carved tree stumps near Scotland's Loch Lomond.

This abandoned boat sits on a nude beach, is shaped like a UFO, and is covered in graffiti.

No one knows for sure why this town's dead refuse to rot.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Built entirely of interlocking pieces, construction of this Chinese Muslim house of worship required zero nails.

Edison's cast-in-place concrete houses were a failure, but way ahead of their time.

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

This secret garden has bloomed into London's most unique hub of urban creativity.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

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

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

Fonts are born and bred here at the oldest letterpress type foundry in the United States.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A slanted tomb honors the faithful, furry companion of the Georgia Tech student body.

A mesmerizing sculpture marks the site where the activist was arrested after evading capture for 17 months.

Stockholm's deepest subway station is also a stunning ecological wonder.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

An imperial art museum offers edible versions of its most treasured displays in an on-site fine-dining restaurant.