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

This modest marker near Notre Dame identifies the very center of Paris.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

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

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The oldest experimental corn field in America is still creating better ways to grow crops.

The park that the Chicago Stockyards built.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A display of magnificent stained glass windows is the first exhibit of its kind.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

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

This historic hotel invented the chocolate brownie.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

A lush green oasis in the middle of Chicago.

A science teacher's dream.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

This midcentury LA bar was the birthplace of tiki culture.