Catacombs turned marketplace.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

A goddess-topped water fountain in Chicago was created thanks to the dreams of a thirsty newsboy.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

A piece of John the Baptist in the American heartland.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Community bookshelf of 25-foot-tall book spines.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

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

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

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

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A museum marks and documents the site of the Titanic's launch.

Northern Ireland's Brobdingnagian stepping stones.