Inside this park, an engineering marvel from the early 20th-century still stands.

A popular Icelandic children's story comes to life inside this cave.

A school teacher's massive and terrifying self-built castle.

A mysterious set of tunnels carved in the hills of rural northern Kyushu.

One of the largest cat sanctuaries in North America is considered a "Club Med" for felines.

This mysterious hill seems to pull objects uphill.

Modeled after the labyrinth in Chartres Cathedral, this small-town Indiana memorial labyrinth sits half a world away.

Even with only two residents and one building, this tiny Illinois town is famous for its burgers.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

A natural gas leak provides a flickering flame beneath a waterfall.

Faces carved into the cliffs create an otherworldly walking trail.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

Take an underground boat ride through a former hydraulic raceway that was built in the late 19th century.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Why have you never heard of the second most popular tourist site in New York?

A contemporary fresco movement illustrates the region's rich history.

The floating gallery illuminates the heart of Québec City's arts district.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

A thriving artist's wonderland located just 6 kilometers from Korea's DMZ.

An all-female order shares an ancient culinary art with visitors at their mountaintop monastery.

A unique structure located on the grounds of one of five grand palaces that were built by the Joseon dynasty.

Step into a cartoon at this Seoul café that aims to evoke a two-dimensional scene.

South Korea's love of the silly photograph is on full display at this goofy collection of trompe l'oeil paintings.