Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Climb inside an iron crystal magnified 165 billion times its normal size.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

The most visited, and possibly most controversial, museum in Germany.

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Eat the ultimate iteration of Portugal's most beloved pastry.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

A rare tour of a commercial jet assembly plant, held inside one of the largest buildings in the world.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

Legend says this sacred tree was a gift from goddess Athena.

This stone tower was built to protect Crete from incoming pirates.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.