Known as "The Dome" this is the world's largest open air geodesic dome.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

An abandoned, rusty old relic of railroad history stands at attention over the Cuyahoga River.

This ''hidden'' 19th-century bridge played a simple, yet important role during the Spanish-American War.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

The first mechanized factory in Spain is also one of the most significant mints in the history of money.

This garden memorial marks the site where 12-year-old Tamir Rice was fatally shot by the Cleveland Police Department.

The scene of a legendary hunt is displayed on this building's facade.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

Dedicated to one of the most iconic cinematographers of the Golden Age of Mexican Cinema.

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

Deep scars on the earth left by the Ice Age.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

A real flying saucer, contracted by the U.S. Air Force.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

The oldest continuously occupied public building in the United States.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.