This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

The glowing blue Nymphaeum of Emperor Tiberius.

This replica of an 8th century burial ship actually sailed to Norway before returning home to Minnesota.

The basement bowling alley of this St. Paul dive bar is decorated with thousands of dollar bills.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

The final resting place of a space program monolith.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

Location of a reliquary containing bone fragments of 18 saints.

This historic Victorian hotel has a scandalous history of affairs and murder.

A trading post in the North Pole where children send letters.

A true roadside icon standing on the same plains that the herds once roamed.

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.

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

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

The deepest metro station in the world.