A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

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

One of the now-less-hidden floral gems of the "Emerald Necklace."

Two thousand artifacts from around the world collected by one woman who loved to travel.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A 125-meter long "tribute to the Brazilian people."

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 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Paris' linguistic guide to the international language of, yes, love.

France's national museum of scientific and industrial instruments.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.