Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This old-fashioned carhop restaurant gave the world the waffle cone.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

An imposing pair of sphinxes stand guard outside this Egyptian Revival tomb.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

This spot memorializes one of the greatest plays in NFL history, unless you happen to be a Raiders fan.

Yo, Adrian!

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

In an odd geographic anomaly this city borders two different states on opposite sides of town.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The tomb of history's greatest potato promoter is surrounded by tubers.

This bridge was constructed from the rubble of the infamous Bastille.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.