This artwork in a Pennsylvania forest will gradually be overtaken by nature.

A T. Rex statue dressed as Mister Rogers honors the children’s-television pioneer.

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

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

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

This secluded walking trail is a hidden gem of a Pittsburgh park.

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

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

A piece of baseball history is preserved in a Pittsburgh parking lot.

An outlet for connecting to memories of lost loved ones and saying goodbyes you never got to say.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

This shop filled with oddities and knick-knacks is named for a 19th-century charlatan.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

An abandoned stretch of highway, deteriorating next to the operational one.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

Home to the abandoned Tioronda Hat Works Factory, this park is a combination of woodlands and marshlands.

Secret Swing.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

10,500 square feet of pinball housed in former dollar store and home to the last playable "Thunderball."

The charming collection celebrates a small Ohio village's Finnish roots.

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

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

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.