Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Try not to get slimed in Tribeca.

Elevated freight railway turned wildly successful urban park.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A crumbling hospital from the 1850s on Roosevelt Island.

A collection of vehicles across American military history.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

A "hospital" where people went to be quarantined, die, and be buried in the yard.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

At 207 feet, one of the world's longest continuous escalators.

A quintet of history museums make this Virginia graveyard as much a resting place for funereal history as it is for people.

The skeletal white beams stand as a monument to religious dissent.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

A small Richmond island dotted with the remnants of hundreds of years of history.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

An opulent testament to the boom-and-bust history of industry in north central Indiana.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.