A popular swimming hole that hides one of America's most deadly diving spots.

Continuing the tradition of the dime museum in style.

A rare underwater observatory in the Caribbean that provides breathtaking views of vibrantly colored aquatic life.

The natural history of Utah is on full display inside this museum.

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

This church was constructed by a shipbuilder and designed like an upside-down boat.

This magnificent natural sandstone bridge is one of the largest in the world and is an iconic symbol for Lake Powell.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

Despite sitting firmly in the global cradle of the Church of Jesus Christ of Latter-day Saints, this Hare Krishna temple is host to one of the largest color festivals outside India.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

Vermont's hills are alive with the sound of music at this historic hotel.

A 60-foot-tall tower provides unparalleled views of the southern Green Mountains.

An ancient glacial pothole waterfall in the heart of the Green Mountains.

Scary metal statues adorn some of the signature buildings of Burlington, Vermont.

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

Country fans may flock to Nashville's music scene, but this Appalachian town is where the genre was born.

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

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

Developed by focused shutterbugs, this museum exposes visitors to more than 6,000 different cameras.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

A genuine Tudor manor transported piece by piece from England.

At 207 feet, one of the world's longest continuous escalators.

America's first public mental health facility.