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

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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

Take a drunken tour inside the world's largest known geode.

A throwback train ride transports passengers through one of the lesser-known national parks in the country.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

The last funhouse of its kind, where guests enter through the mouth of an 80-year-old blue whale.

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

The god of wine stares out at passersby on this busy Pittsburgh thoroughfare.

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

Hundreds of protractors affixed to surfaces all over the city.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

An industrial waste tourist attraction.

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

This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

This abandoned iron furnace was one of the first to use coke—a type of high-carbon fuel—to make iron.

The last street in Pittsburgh that's paved with wood.

An office built to look like a giant basket.

Rare recess caves fill this unbelievably beautiful Ohio park.