These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

The fairy tale castle of the "fairy-tale king."

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

The prototype for all Nazi concentration camps.

King Ludwig I's collection of beautiful women.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A unique seaside cave where Aleister Crowley faked his own death.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The world's oldest bookshop still in operation.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

Where the lovelorn find a home for their sentimental keepsakes.

These 400-year-old ruins are all that's left of the monastery where Ines de Castro was assassinated by the King of Portugal.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

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

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

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

Legend has it the lovelorn tears of a princess and a shepherd boy formed the blue and green twin lakes in the Azores archipelago.

This abandoned five-star hotel is now a five-star urban exploration destination.

You were once able to challenge a chicken to tic-tac-toe at this park, which is now converted into the Aikman Wildlife Adventure.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

At 431 feet and 10 inches, this is the longest historic covered bridge in the United States.

This museum collects over a century of automobile history including the iconic car from The Muppet Movie.