This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

Breathtaking and huge 430 year old maps of Italy.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Once a black market electronics marketplace, now an otaku shopper's paradise.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

A King Kong-like gorilla hangs from the top of this commercial building in Tokyo.

Disused for decades, this freight railway bridge is finally being renovated into a scenic promenade.

Dedicated to the armor and weapons used by the legendary Japanese warriors.

Not quite the menace it once was, this monster still has some chops.

A 20-meter (65-foot) robot towers over Tokyo Bay.

If Hello Kitty were Mickey Mouse, this would be Disneyland.

Ever hear of the Milazzo Cage?

One of Rome's most picturesque and original bridges was also a popular choice for Grand Tour artists.

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

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The site of London’s first coffee house has been serving refreshments of one kind or another for 360 years.

A wall of chewing gum moonlights as collective art.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

A bronze replica of half-consumed salt lick honors a quirky town tradition.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

A stunning landscape of bunkers that once stored chemical weapons.

The only Native American museum along the Oregon Trail, run by the peoples who have lived on the land for generations.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

After this former brothel closed, its interior remained almost frozen in time.