Penn State's giant bug collection.

No one knows who painted this mysterious mural in a Penn State basement.

An enormous, inside-out glass globe built in 1935.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

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

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

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

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

The romance of early commercial flight still fills this Art Deco destination.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

At 207 feet, one of the world's longest continuous escalators.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

In the "Danish Capital of America," a replica of one of Copenhagen's most iconic buildings.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

A classic carnival ride that was carved to be untouchable.