A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

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

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

Rare recess caves fill this unbelievably beautiful Ohio park.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Home to items never before seen by the public.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Two dozen pinball games hidden away inside a most unlikely location.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A throwback to 1980's gaming nostalgia.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

“Live hard, ride fast, eat pizza” at this joint filled with Evel Knievel memorabilia.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

A Canadian POW for German soldiers during WWII where prisoners hatched an elaborate escape plan.