This elaborate towering structure was once famed for its revolutionary height.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

This subterranean funicular is one of the world's smallest subways.

Breathtaking and huge 430 year old maps of Italy.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

Steadily reminding Czechia of its past.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Macabre astrological automaton clock dating to the late 1400s.

Metro station with a claim to rock n' roll fame.

Where once there was a train station bathroom, there is now this German burger joint.

Cold war icon and onetime "hole" in the iron curtain.

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

An ancient Egyptian temple in the middle of Madrid, Spain.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

A "miracle" that seems to produce more holy fistfights than holy revelations.

An easy to overlook storefront hides some of the most authentic and regionally diverse Chinese food in New York.

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A winding, cliffside stretch of road overlooking the Delaware River.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

An ancient capital city that dates back 3,000 years and harbors many surprises.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.