The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Montreal's colorful subway station shows its support of the local LGBT+ community.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Its columns were all carved from the same white oak tree.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

An exotic wildlife habitat right off The Strip.

A piece of the iconic wall found an unlikely new home in a Vegas bathroom.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

This 13th century Gothic brick castle is the largest in the world by surface area.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

17th-century merchants in Bristol nailed their deals by placing money on these pedestals.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This giant roadside fruit is home to an array of apple-based treats.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

A unique collection of Science Fiction, Fantasy, and everything in-between.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.