A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

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

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

Spectacular volcanic cliffs along the Crooked River invite hiking, rock climbing, and photography.

An attractive free-plunge waterfall outside Bend in the Deschutes National Forest.

Tucked away on a scenic trail, a modest memorial honors one of the greatest writers of our time.

Public works and national defense project meant to carve a canal all the way across the state of Florida.

This underground oasis is one of North America’s most fascinating prehistoric places—and you can scuba dive in it.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Though illegal, city officials have made an exception for this work of art.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

A tribute to Ponce de Leon's supposed quest for eternal youth.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

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

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

Shakespeare has been brought to life in this open air theater for the better part of a century.

A public fountain that spouts "health water" from a nearby spring.

This natural marble cave is one of only five national monuments in Oregon.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

A volcanic fissure over two miles long and up to 70 feet deep.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Massive crater in central Oregon.

Eat like a "buckaroo" at this remote restaurant.