The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

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

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A famous burial ground with a history both grim and literary.

A unique tribute to the millions of animals who served and died for the British military.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Repository for more than 22 million pickled specimens.

Eighty million natural history specimens call this gargantuan museum home.

A clock designed to run with perfect accuracy for 10,000 years.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

Charles Babbage's proto-computer, painstakingly brought to life.

Hidden beneath the streets of London is a secret subway that only carried mail.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

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

A terrific purveyor of natural history objects and curios.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The oldest playground in America.

Historic Hull Street was actually the first street with a proper name in the Boston area.