Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The fairy tale castle of the "fairy-tale king."

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Steepest flood safety railway in the entire world.

Memorializing an American tragedy of massive proportions.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

A walk through the historic city center, under the streets of Seattle.

A colorful architectural gem in Seattle's uniquely modern Central Library.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

One believer transformed a local curiosity into proof of Vikings on the Great Plains.

Where hills of dirt conceal the burial ground of one of the most powerful ancient Native American societies.

An oil baron's wild paradise and the winner of an ill-fated air race.

These massive mitts are made of 30 tons of devotional bronze.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

A six-ton wedding present for the King of the Scots.

Famously misunderstood wonder of the ancient world