The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

This park is home to California's first oil boomtown, with structures that have stood for more than a century.

Gouged in the mountain to make stage coach access easier through the Fremont Pass.

Now housed in a museum, this giant pink elephant stood in downtown Seattle for more than 60 years.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

View the California coastline (and the home of Barbara Streisand) inch by inch with stunning, government-sanctioned aerial photography.

This sculpture forces visitors to confront their relationship with space.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

A small Montana town commemorates the dog who waited at the train station every day for his owner to return.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

The oldest still-existing mosque in the United States sits in a remote prairie in North Dakota.

The pharmacy's retro ice cream mixer is one of the last of its kind.

This museum is a full-size replica of an original church constructed during the 13th-century.

A monument to the center of the North American continent may be off by a few miles.

This sky-high radio mast is formerly the tallest man-made structure in the world.

This replica of an 8th century burial ship actually sailed to Norway before returning home to Minnesota.

The statue honors the booming birds Rothsay, Minnesota, is famous for.

A riverside park built around the ruins of a massive dam that collapsed in 1909.

After four years of grasshopper plagues, this chapel was erected as a plea to God to make them end.

Thousands of majestic trumpeter swans fill this park, sounding distinctly like a certain brass instrument.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

Triangular House built on a leafy residential street in St. Paul.

Where the notorious gang lived while on the run from the FBI.