In the power of this waterfall, Alexander Hamilton saw the potential for industry.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

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

Most-visited and most-photographed slot canyon in the American Southwest.

This Moab institution functions as both a rock store and a small natural history museum.

The last SR-71 ever constructed.

Visitors to this library are in for a real-world education in modernist architecture.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

The fifth-longest natural arch in the world, and the longest outside China.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

The second-highest train station in Europe.

A daily replay of the experiment that proved the rotation of the Earth.

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.

The Brigadier General was so afraid of being buried alive that he had a buzzer installed in his mausoleum, just in case he woke up.

The highest natural point in New York City and all of the Atlantic coastal plain.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

A small obelisk commemorates the launch site of the world's first liquid-fueled rocket.

This former water source for the City of Brooklyn is now a thriving natural wetland.

The oldest covered railroad bridge still standing in the United States.

This location of a Mexican chain restaurant has a unique location: an old jail.