A Grand Dame of the vaudeville circuit restored to its former glory.

Built around 1723, this is the oldest surviving home in the U.S.'s oldest colonial city.

One of the oldest, tallest, and most haunted lighthouses in America.

This now-deactivated naval base defended the Florida coast for centuries.

St. Augustine's record-setting narrow street was designed to protect against pirates.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The only Florida state park with publicly accessible caves.

Working compound meant to allow visitors to reclaim the values and traditions of the past.

For decades, the largest tungsten producer in the U.S. was located in a spectacular setting in the high Sierra Nevada, with some of the workings over 11,000 feet.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

How Quincy, Florida became the richest town per capita due to one man's shrewd business acumen and taste for fizzy drinks.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Towering basalt columns, a creation of fire and ice.

An Industrial Revolution-era public work that purified water using nothing but sand.

Elvis's own personal tropical hideaway.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.