At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

This massive airship factory is so large that it has its own indoor weather.

The first burial place of the Harmonist Society, a utopian community for which the surrounding town of Harmony is named.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

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

The angel of death appears to weep black tears at this grave marker.

The only presidential monument to display a late POTUS's actual casket.

A jukebox headstone marks the grave of the Cleveland disc jockey credited with coining the term “rock 'n' roll."

A dazzling display of lights and crystals.

This little museum in the town where zombies were born celebrates the living dead.

The Paul Bunyan of the steel industry.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

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.

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

This icon of the Atomic Age now lays dormant.

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

This restaurant offers a side of antiques, curios, and a bathroom chock full of owls.

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

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

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

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