A forgotten "city of water" underneath the famous Trevi district.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

A subterranean shelter remains intact under a busy Paris railway station.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

A tribute to the life and work of the beloved "Peanuts" cartoonist.

The most unique castle in all of Southern California, entirely constructed from repurposed materials.

This turn of the century masterpiece has a mysterious goaty interloper.

Ingenious bakery opens up the first Cupcake ATM at their flagship location in Beverly Hills.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

How did this lovely seaside English village come by such an unusual name?

The only monument to name all of the passengers and crew who died on the RMS Titanic.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

Belfast's namesake river still winds below the city center, hidden from sight.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.