This modern arts center is built around a gem of late-Baroque architecture.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

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

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

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

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

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

This proud Teutonic warrior rises out of a German forest heralding a victory and measuring lightning.

This famous city eluded concrete detection until the early 2000's.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

All that remains of one of the Civil War's more deadly POW camps is a simple flagstone.

The little-known final resting place of one of America's greatest writers.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

A memorial to the 1913 tragedy that helped protect the workers of the future.

A gazebo that inspired the fifth episode of the "Twilight Zone" still stands in the creator's hometown

A statue commemorating a 16-year old girl's nighttime ride to raise a militia against attacking British troops.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Life-size bronzes of the Grinch, Cat in the Hat, Yertle the Turtle, Sam-I-Am, and the Lorax—and the author himself.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.