These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

These abandoned grain silos and tunnels are an urban exploration dream.

A historic and oft-filmed prison stands in a Chicago suburb.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

This tiny historic jail along Route 66 is the perfect fit for exactly one criminal and their partner-in-crime.

This abandoned 19th century orphanage started as a boarding school for children of Civil War veterans.

The carved remains of a 200-year-old oak tree memorialize the namesake of the iconic "Wizard of Oz" character.

The empty tomb that houses the memories of Roy Bertelli's revenge.

One of the largest carillons in the world, this giant instrument has 67 cast-iron bells played by a keyboard.

The poet’s boyhood home is now dedicated to celebrating his life and legacy.

Who said a biker bar is no place for a taxidermy squirrel collection?

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

A chessmaster's dream destination.

This is not your typical jungle gym.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

Famous church recognized for both its unique design and disciplined monks that live according to the Benedictine discipline.

A sculpture of a giant man escaping from the depths of the Earth.

After miraculously surviving a giant flood, the 19th-century nut tree and its offspring are protected with their own tiny park.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

The world's second largest rocking chair is found on Route 66 in Cuba... Missouri.