A room hidden behind a swinging shelf in the children's section.

A collection of the best toys ever made, The National Toy Hall of Fame is filled with kids, fun, and for some reason, a bird preserve.

Comprehensive gaming collection of over 30,000 electronic games and consoles.

A Frankenstein blend of science and art allows one tree to produce 40 different types of stone fruit.

Built by the patriotic residents of Boonsboro in a single day.

A monument marks the location of the first successful steamboat demonstration.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Time travel with sweets across history at this research-based candy store.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

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

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.

A 9-story, poured concrete structure which was used as a glue factory with an indelible smell.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

A collaborative art project that transformed a neighborhood in NYC's Queens.

This Queens hospital has stood abandoned for almost 20 years after its patients were secretly relocated in the dead of night.

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

Nestled in Onondaga State Park, over 100 canoes carefully stacked in a replica of the famous standing stones.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

University City's quirkiest resident lives in a park named after its first.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

One Confederate statue that accurately reflects the ugliness of its subject.

This popular park is home to a sea serpent sculpture that now overshadows the twisted history of its creation.

It may take some time to locate, but it's sure to warm even a heart of stone.