Visit the monolithic tomb of America's most famous general.

A Gothic-style abode built to accommodate the church's three resident peacocks.

The "Seinfeld" diner.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

Where the legendary Orson Welles got his theatrical start before "Citizen Kane."

A sculptural commentary on capitalism pokes up from the East River.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

The remains of what was once the world's steepest passenger funicular.

Built in the 1920s, this co-op in the Bronx feels more like an Italian villa than a typical New York apartment building.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

A popular European tradition makes its way to the states on one of America's most famous bridges.

This taxidermy scene brings the struggle for survival in the Indian jungle to a quiet corner of a Manhattan museum.

A controversial magical figure is hidden within a diorama of the city.

An eerie diorama that captures the majestic nature of a few prehistoric-looking beasts.

This impressive scene portrays the elusive forest giraffe of Central Africa.

This morbid scene depicts the Darwinian drama of death on the African savannah.

This magnificent herd of stampeding elephants has been frozen in time for over a century.

Here be dragons.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.