This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

An icy lake tucked among jaw-dropping alpine panoramas.

The world's first and only three-segment bascule bridge folds up into the shape of a capital "N" to let boat traffic through.

A century-long search for a church that was never there.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

Four-story slides send people whizzing through the math department at this Munich university.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

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

Metro station with a claim to rock n' roll fame.

A strange rock formation with numerous legends trying to explain it.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

Cold war icon and onetime "hole" in the iron curtain.

One of downtown Berlin's last reminders of its Communist past.

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

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

The great Danube river starts here.

A restaurant and observation deck built in a unique broadcasting antenna.

The prototype for all Nazi concentration camps.

Blitzkrieg bop your way through Berlin's Ramones Museum.

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

A gender-bending antihero's grave, where lies the inspiration for both book and film.