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

The very center of Paris is surrounded by a bevy of strange good luck rituals.

An ethereal glowing blue ocean cave in Croatia.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

Single runway interrupted by a busy road that cuts across its middle.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

This artificial archipelago was supposed to resemble a map of the world.

This indoor ski resort has a mountain contained inside a mall.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

This futuristic building is yet another architectural wonder in Dubai.

This enormous sports car themed amusement park is home to the world’s fastest roller coaster.

Whitewashed mosque contains the world's largest carpet.

The ancient latrines of the Greeks, in all their public glory.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A statue honors the children who fought Nazis in Poland.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Antique cinematography artifacts fill this museum dedicated to the inventors of the moving picture.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.