Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

An acoustic anomaly with a mysterious cause.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

This whimsical fountain pays tribute to Toronto's four-legged friends.

House built with over 60,000 glass bottles.

This monument honors the band's impromptu performance at Cadillac highschool's homecoming decades ago.

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

Rushing water plunges over a 100-foot drop created by an ancient lava flow at this majestic waterfall.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

This frequently-photographed waterfall takes only a short hike to visit.

Formerly secret, precariously perched boulders.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

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

The best place in the world to buy tinned fish.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

At HopCat, a marker honors fictional creatures with the ability to travel the missing dimensions of Kcymaerxthaere.

Where most of the world's flypaper was made.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

This now abandoned restaurant provides some of the most amazing views of Lisboa.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.