Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The first home of the doomed aviator Amelia Earhart.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A dozen U.S. presidents have stayed at the historic resort, which was known as James Buchanan’s “Summer White House” from 1857-1861.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This super steep hike ascends 2,000 feet in less than a mile.

When ecosystems collide in the arid Southwest.

European castle ruins in an American state park are actually the product of death and grief.

The largest self-built castle in the U.S., six decades in the making.

The last funhouse of its kind, where guests enter through the mouth of an 80-year-old blue whale.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

This Colorado fire station has been in continuous operation for more than a century.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The celebrated eyesore created by starry-eyed sweethearts.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

France's most famous cemetery, with some of its most curious tombs.

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

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

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.