The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

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

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

There aren't too many operational funiculars around, but Pittsburgh has two!

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

Model Trains and Much More in Hamburg.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

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

Berlin's old airport.

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

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

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

King Ludwig I's collection of beautiful women.

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

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Pilgrimage site for star-crossed lovers.

Macabre astrological automaton clock dating to the late 1400s.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."