The overgrown remains of one of the premier auto-racing speedways in the Midwest—and also one of the most deadly.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Tiny castle in the middle of the Rhine made you pay to pass.

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

Go surfing on this urban wave, "hacked" by local surfers.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

This lurid German fountain plots the sad course of marriage from dating to death.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The great Danube river starts here.

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

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The prototype for all Nazi concentration camps.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

"The most colorful grottoes of the world.

Art and a pun, all in one.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

Terrifying derelict military hospital once housed a recuperating Hitler.

A small but immensely extravagant palace built by the "Night King."

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

A man-made island in scenic San Francisco Bay.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.