The social hall of this former factory is a Communist-era time capsule.

The only remaining vespasienne in Paris is a (stinky) relic of Resistance.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

The site of slaughterhouses that once satisfied Parisians' taste for horse meat is now home to a park and book market.

A massively oversized measuring tape sculpture sits inside a hidden yard.

A modern and feminist reinterpretation of the famous Wallace Fountains.

This small island, a byproduct of 19th-century canal construction, is now home to a charming Japanese garden.

A chain coffee shop in Bulgaria that takes its Italian roots very seriously.

These natural cliffs look like they are a part of an old castle complex.

An abandoned sanatorium building from the early 20th century sits in the forest of the Rila mountains.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

Not far from a popular beach, an unfinished, abandoned mansion for Bulgaria's last communist dictator.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

The unusually large seat sits atop the base of a ruined temple.

A fearsome dragon clings to a corner of Munich's city hall.

Go surfing on this urban wave, "hacked" by local surfers.

Founded in the 4th-century, the town of Pernik plays host to the Surva Carnival⁠—a magnificent display of masked Kukeri dancers.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

Marie Antoinette and Napoleon Bonaparte were fans of this 200-year-old French chocolatier.

Picturesque basketball courts sheltered by historical defensive walls and with an enviable sea view.

The location of this small park was once the site of an infamous public morgue.

Step inside this medieval Orthodox gem and travel back to the 16th century.