This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

This hidden jockey “walk of fame” celebrates the winning riders of the Kentucky Derby.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

A historic landmark and museum filled with curious objects representing the history of Key West.

When this test site was abandoned, they didn't even bother to take the rocket with them.

Found: Garden of Eden in Miami-Dade County, Florida.

These constructed wetlands naturally filter millions of gallons of treated wastewater every day.

Caligula's colossal pleasure ships, discovered by Mussolini only to be lost in flames.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Sweden's "good old days" painstakingly re-created in a model village.

The Swedish flag over this small naval fort signals that the nation is at peace.

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

This floating sculpture of ice is a poignant reminder of nature's power.

This concrete sculpture features a woman opening her heart to showcase a beautiful fern.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

Nothing says indulgence like a 1,500-pound chocolate castle.

An ode to filmmaker George A. Romero, who used the mall to film an iconic horror movie.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."