This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

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

This tiny home was originally a narrow alleyway.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This small fort played a huge role defending Puerto Rico’s capital city.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

The ruins of the first Spanish settlement in Puerto Rico.

Puerto Rico's oldest rum producer started its 140-year-old business with "a little barrel."

This giant bronze image of Christopher Columbus embarked on a voyage of its own.

This community-driven organization uses education and eco-friendly technology to protect the environment.

These red and black houses were awarded to the firefighters who saved their city from an enormous blaze.

The abandoned remains of this once-thriving hotel looms over the city, awaiting an uncertain future.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Dr Barnes' $25 billion private collection of art and arboretum.

The first American department store, and home to the largest operating musical instrument in the world.

The world’s first penitentiary, meant to be humane, drove men insane.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.