A Nesting Doll of Churches.

This ancient market is often referred to as the oldest shopping mall in the world.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

Famously misunderstood wonder of the ancient world

A quiet memorial to those who died saving others in the heart of the City of London.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

The famous aviator's final resting place is a study in natural beauty.

A tunnel of hardened lava along Maui’s famous Road to Hana.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A small abandoned and abused cemetery that has become a magnet for ghost hunters.

What may be America's largest classic video game arcade lurks inconspicuously in a Chicago suburb.

It was originally part of a "terrible lizards" collection at the 1964 New York World’s Fair.

Julia Buccola Petta's body was peculiarly well-preserved when it was exhumed six years after her death.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

The famous author's birthplace is preserved in a town that he once described as narrow-minded.

Pumpkin-like gargoyles and grotesques peer down from the rooftop of this unassuming apartment building in Illinois.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

Home to a protest movement, a bombing, and a dramatic change in labor history.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."