Former villa and estate of James Deering developed to preserve native tropical forests.

The smallest post office in the United States is no bigger than a broom closet.

This isolated airport in the middle of the Everglades sees more alligators than planes.

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

This floating sculpture of ice is a poignant reminder of nature's power.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

The world’s largest Masonic temple was saved by the White Stripes.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

This public baseball field is a beloved remainder from of one of the most historic stadiums in the country.

Where Saint-Martin ends and Sint Maarten begins (or vice versa).

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

As its grandiose name implies, this wooden dome is unsurpassed in size.

Dubbed the "Blade Runner dragon," this buzzing neon sign is a beloved local icon.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

A tunnel with windows, so you don't miss out on the impressive views.

A museum dedicated to the alleged Roswell Incident.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

This spectacular track has run continuously since 1882.

A hotel with a rich Wild West history of miners and bootleggers.

Ute tour guides have been sharing the ancient dwellings and rock art inside this large park with visitors for more than 40 years.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.