A memorial to honor those who were killed in a Bastille Day terror attack in Nice.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

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

What was once an ordinary pedestrian tunnel under Gorizia Castle has been transformed into an immersive artistic experience.

This saucy statue once caused outrage among locals.

A place to see how French aristocrats lived in the early 1900s.

Where the lovelorn find a home for their sentimental keepsakes.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

A thriving community of Taiwanese art.

The world’s largest work of glass art hides in this stunning Taiwanese subway station.

This seaside museum boasts a colorful collection of over 3,000 shells, the largest in Taiwan.

A Japanese-era military tunnel is now a psychedelic art exhibit.

There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

A medieval cave used to shelter local hermits now holds nearly 200 old Quaker gravestones.

A historic, reportedly haunted pub that provided inspiration for several famous adventure novels.

An ornate doorway leads to the former site of one of the city's oldest society of merchants.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

An alchemical monument that represents "Earth, Air, Fire, and Water."

This church is said to have connections to the Knights Templars.

A unique sculpture cemetery dedicated to the region's defunct businesses.

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.