The abandoned ruins of a beautiful medieval castle just outside Barcelona.

Breathtaking Byzantine paintings cover the inside of this 12th-century church.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

This remarkable prehistoric town is full of watchtowers and houses that have withstood thousands of years.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

Bacteria and algae give the salty water its bubblegum hue.

Iran's colorful terraces are a rare geological masterpiece.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

Once home to Komodo dragons, this island dreamscape has a rare combination of white, pink, and black sand beaches.

This crumbling Art Deco movie palace in Mexico City has been abandoned for two decades.

This tree was extinct for a thousand years before sprouting again from a 2,000-year-old seed.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

You can cross from one country to another in a single hop on this little bridge.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.