The oldest residential street in Europe also features an optical illusion.

This ancient bridge made of stone slabs is said to be reserved for the devil to sunbathe.

400-year-old garden, restored to beauty.

This tangled English forest looks like something right out of a fairytale.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

This sublime architectural marvel is a rare example of an expressionist church.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Copenhagen's celebrated theme park and gardens.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Abandoned railway line circling the city of Paris.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

These mystical miniature houses bring a touch of magic to the New Jersey woods.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

This abandoned factory on the Hudson River once churned out a million bricks a week.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

The remains of what was once the world's steepest passenger funicular.