The world's oldest and largest museum of mass transit vehicles.

An 18th-century home taken over by antique automatons and musical machines (Closed).

Site of a former hidden treehouse in New Orleans.

The curiosities and wonders of pharmacy in a delightful historic building.

A miniature train-ride through Slovenia's largest cave system.

Former bath house turns gastropub.

A Bibliophile's Dream.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The world's largest model of our planetary system.

The single richest source of elemental discoveries in the world.

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

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.

Display that gathers the basic elements of the universe in one convenient location.

One of the world's largest model railroads is a mind-boggling achievement.

Mysterious rocks that ring musically when struck.

A take-out restaurant that only serves cuisine from countries with which the United States is in conflict.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Bizarre Cavern.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Historic funicular railway, believed to be the shortest railroad in the world.