The "Seinfeld" diner.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

The location where the American Revolution ended.

An out-of-the-way wildlife haven with a rich and storied past of harboring thousands of fugitive slaves, or "Maroons" during the mid 1800s.

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

Enjoy dishes that founding fathers once ate at this Colonial Williamsburg pub.

The maritime museum that boasts the largest nautical library in the western hemisphere.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Pay a visit to America's oldest yarn shop.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The secret city built by the Manhattan Project.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

Dedicated to the explorer who opened Japan to the West.

A work of art that pays homage to a Victorian timepiece in Providence.

Mysterious stone tower featured in many alternative histories of the New World.

You can spend the night as an honorary lighthouse keeper in this quaint, historic beacon.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.