Meet manatees face-to-face at this zoo for native species.

Despite being made of a seashell mortar, the crumbling remains of this historic Florida mill are still standing.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

When it opened during the final years of the embargo, all the drinks and cigars were free.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The bears may be gone, but their old cages can still be found.

Bonsai trees that are up to a thousand years old.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The world's first time capsule lies behind a welded steel door in Atlanta.

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

This park contains a number of standing stones meant to heal and inspire.

Jacksonville's highways rendered this century-old grammar school unusable.

Former farm staffed by mental patients is now a public park.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

Nature's biggest mammal swims in landlocked Oklahoma.

This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

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

An abandoned asylum incorporated into a college campus.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.