A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

San Francisco's newly reopened hands-on science museum.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

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

A hands-on traveling collection of the innovative devices of yesteryear.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

This bar is filled with Star Wars merchandise from around the world, all of it unlicensed knockoffs.

This Japanese national treasure was originally built in 593.

Peace Park and the Atomic Bomb Dome.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

This whimsical garbage disposal facility receives around 12,000 accidental tourists each year.

This shrine to bovine consumption and all things fast food is a slice of culinary history both rare and well done.

A science teacher's dream.

The final resting place of the world's first nuclear reactor.

The sole remaining outpost of a once-thriving South Carolina chain still sells “pic-a-nic” baskets.

In 1952, this restaurant began selling the Colonel's “secret” recipe.

The first KFC is on the National Register of Historic Places.