A free, public museum dedicated to the fascinating science of sight.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Floating man-made island and upscale restaurant.

An abandoned stretch of highway, deteriorating next to the operational one.

Where decommissioned airplanes and helicopters go to become part of Hollywood.

137 graves holding New England's earliest residents.

Early prototype for Frank Lloyd Wright's Guggenheim.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

Phil Mortillaro uses keys to bring art back to the Village.

An architecturally-focused antique shop.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

An entire town preserved as a historic landmark.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Ruins of a Carnegie family mansion on Cumberland Island.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

A rich history stashed behind an unassuming door in the heart of Gold Country.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

A hidden architectural treasure in New York's Brooklyn.

This interactive gallery makes you feel like you've stepped into a fantasy world filled with whimsical monsters.

Lehigh Valley barge No. 79 still gets tugged along - but now it houses a museum and unusual performances.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

An extravagant western hotel where every floor is the "ground floor."

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.