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

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

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

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

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

A life-sized mammoth sculpture marks the spot where the remains of a Columbian mammoth were discovered in 2005.

St. Mary in the Mountains is the oldest active Catholic church in Nevada

This place claims to be North America’s first vegan convenience store.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

The sole surviving relic of the San Francisco neighborhood cobbled together from old horsecars and streetcars.

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.

A 300-ship graveyard, with a few still visible at low tide.

This shop specializes in oddities and Victorian-inspired wonders.

This sailor's boneyard was lost under a parking lot for decades before being rediscovered.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

San Francisco's newly reopened hands-on science museum.

A modern frieze of ancient Grecian mythological figures playing a national pastime.

The original place where water met land in the City by the Bay is outlined in brass.

The rest of him lived another 61 years and was buried elsewhere.

100 years of rolling bus history and Hollywood cameos.

The black lab that was voted mayor of a California town is forever remembered by a life-size statue.

A historic office and commercial building located in the heart of downtown San Francisco.

This sculpture was made out of recycled guns that were turned in to the city.