The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Lavish royal estate punctuated with heated greenhouses.

This small group of sand dunes manages to pack in a strange rainbow of colors.

This futuristic building is yet another architectural wonder in Dubai.

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

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

A faithful reproduction of Al-Jazari's enormous water clock.

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

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Climb to the top of the world's largest seated bronze Buddha.

Known as the wettest place on earth.