This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

Dramatic river bend surrounds a natural red-rocked pedestal.

Legends surround this jagged rock formation in the New Mexico desert.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

An outlandish shoe shaped house built by an eccentric millionaire.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

"Where the ducks walk on fish."

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This historic lighthouse was well known for the large number of women who served as its keeper.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

Once America's tallest structure, now a Baltimore landmark.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

Bizarre Cavern.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

When ecosystems collide in the arid Southwest.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Home to the deepest rift anywhere on Earth.

This set of three large, volcanic hot springs is a favorite haunt for intrepid divers.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.