A lingering bit of Space Race nostalgia lies in the middle of the desert.

A striking public sculpture representing the period of martial law in Communist Poland.

A collection of old neon signs from all over Poland line a secluded courtyard.

The silly symbol for an underground protest group is now scattered around the city.

Relive a Polish uprising via an enormous, century-old cyclorama.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

The location of this small park was once the site of an infamous public morgue.

Seven dragon statues—including one that breathes real fire—are scattered throughout the streets of Krakow.

Ruins from the Parthenon and petrified wood line the interior of one of the world's most famous monuments.

An exceptional engineering feat that facilitates the migration of salmon upstream during their breeding season.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

London’s first road overpass is so old that it was originally built for horse-drawn carriages.

The niches over the western entrance of Westminster Abbey honor individuals from the 20th century who gave their lives for their Christian beliefs.

Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

One of New Jersey's oldest churches is a historical treasure trove.

This ruined castle is said to be the legendary keep of a Viking princess.

The train collection of an eccentric New England seafood mogul is now a National Historical Site.

One of the oldest, tallest, and most haunted lighthouses in America.

Enormous crabs, bioluminescent jellies, and other amazing creatures from the ocean’s depths—some of which are in an aquarium for the first time ever.

This haunting monument honors the victims of 9/11.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

Browse through a century of this principality's first popular export.

A wooden theatre that remains the heart of a charming Victorian-era New Jersey enclave.