A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

Three hundred years of preserved Spanish colonial history in San Antonio.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

A 131-year-old wunderkammer of Texas history.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

One of two side-by-side totem pole parks dedicated to educating visitors on Tlingit history and culture.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

Astounding collection of coin-operated games and automata.

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

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Climb inside an iron crystal magnified 165 billion times its normal size.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

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

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

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

Elevated freight railway turned wildly successful urban park.

The world's largest wooden structure.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.