Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

Recovered from the brink of extinction, at home in the Financial District.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

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

Floating man-made island and upscale restaurant.

Where a staggering 747 ships were constructed during World War II.

A sparse, solitary sequoia still stands as a living tribute to the famous conservationist who planted it—but it's dying.

The secret city built by the Manhattan Project.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

An abandoned town is hidden in Great Smoky Mountains National Park.

This monument claims to display the first pot used to cook a famed Southern stew.

A modest walled graveyard where nobody is actually buried.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

Georgia's first brewery is also one of its oldest surviving buildings.

The ruins of an open-air theater built on this Georgia island in the 1970s.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

This small island was the first National Wildlife Refuge ever created in the United States.

A bronze tribute to the everyday activists of St. Augustine's civil rights struggle

A market building entangled in St. Augustine's history of slavery and civil rights protest

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