Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

A giant gun barrel in Barbados that once hoped to shoot outer space with science.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

Fantastic stories on a miniature railroad.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Double spiral staircases are not unheard of, but they are very rare.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

A Yiddish theater turned movie house turned rock and roll landmark turned gay disco turned bank.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Ancient serpentine sacrifice holder that has stood the test of time.

A fountain standing as a testament to a doomed alliance.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

Macabre astrological automaton clock dating to the late 1400s.