The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

A public art jibe at one of the United States’ oldest and longest-serving senators.

This groundbreaking 16th-century map is known as "America's birth certificate."

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

This rowhouse doubles as one of the most photographed spots in the nation's capital.

The only female equestrian statue in Washington, D.C. is a 15th-century French heroine.

This small stone building, the final work of a renowned artist, offers a peaceful environment with radiant, colorful glass windows .

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A tunnel with windows, so you don't miss out on the impressive views.

This granite monument at the site of an ill-conceived tourist attraction is built from the same stone as the Mormon Temple.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

This super-sized skillet is a replica of a usable giant pan where a woman once skated on bacon.

Home of Jake the Alligator Man, the mummified remains of a cigar smoking, cross-dressing celebrity of the Northwestern coast.

A Roman-style column in Oregon hides a spiral staircase inside.

100-year-old shipwreck you can walk up to at low tide.

A massive sea stack famous for its appearance in The Goonies.

A logging-themed roadside restaurant surrounded by museum-quality machinery and artifacts from the industry's heyday.

The largest wooden building in the world now houses a fascinating collection of aircraft.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

Home to the only outdoor municipal elevator in the United States.