This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Trinkets and toys lovingly handmade by maximum security prisoners.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A beautiful Victorian-era cemetery, complete with a miniature village.

An enormous, inside-out glass globe built in 1935.

An elaborate, hidden model train in the Needham Town Forest.

The oldest surviving wood-frame building in North America is still in the family.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

The Atlantis of Cape Cod reemerges during the lowest of tides.

Eclectic collections, artwork, and some feline friends fill the writer's former home.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

The 14th-century ruins are said to contain healing powers.

Half-size replica of the Taj Mahal.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Plot your trip through the city on the sidewalk.

The 28-foot granite map plots the locations of 40 theaters in New York City.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.