Though illegal, city officials have made an exception for this work of art.

The smallest chapel in Europe is a moving testament to the love between a husband and wife.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Part of a highway network meant to connect Miami to Montreal, this 10-mile stretch of road made from red bricks is still around 100 years later.

Town of spiritualists and mediums in Florida.

An Orlando museum houses the world’s most comprehensive collection of work by Louis Comfort Tiffany.

The "I-4 Eyesore" is one man's dream that has stood incomplete for over 20 years

This tree has witnessed nearly 1,000 years of history.

A tribute to the Nirvana frontman hides beneath the bridge that was the singer's beloved hangout spot.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

See the imprints of ancient trees, burned and preserved by lava.

These memorials built by an eccentric bachelor on the side of Interstate 5 cause both wonder and traffic accidents.

The lighthouse is on a island which is connected to another island, which is connected to another island, which is connected to one of the largest islands in the world.

A community gathering place that once housed half-ton tanks and the World's Fair.

The world's longest known cave system.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

A stunning Victorian abbey and walled garden on a lakefront.

When the tide is high, you can see the Atlantic pushing up through a deep, jagged hole in the rock.

The abandoned bathhouse is all that remains of the hot springs considered Florida's original tourist attraction.

Nature puts on a spectacular show at this blowhole on the eastern side of Gran Canaria.

An abandoned water sports stadium that has become a haven for graffiti and decay.

A small strip of artistic displays is tucked away in a flea market.

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.