The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Statue dedicated to the star of an old television show.

This striking art museum holds an amazing series of curiosity cabinets.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

When flour explodes, it's not a pretty sight.

The only arched bridge made of stone on the entire Mississippi River.

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 monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This heritage rail line meanders through Delaware’s Red Clay Valley.

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

One of the oldest colonial buildings still standing in South America.

An intriguing antique iron Ferris wheel that most locals are sure was designed by Gustave Eiffel.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A bright little alley in La Boca is a part of tango history.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Constructed on the ruins of a convent, this tower saved countless lives.

This historic stadium was built to host the first-ever FIFA World Cup.

Seat of the Duke and Duchess of Devonshire for centuries.

A seaside town with no sea in sight.