A chimney and a plaque are all that remains of a logging camp that once cleared out a large swath of Minnesota's old-growth forest.

One of the few Cold War-era bases with many of its original structures still standing.

Once the extravagant escape of the Ford family, this enigmatic ruin now stands as a haunting reminder of its former glory.

An enormous factory from the late 1800s sits abandoned on Cleveland eastside.

The last remnants of a lakeside airport that was bulldozed overnight by the mayor of Chicago.

The oldest living cultivated fruit tree in North America.

Local lore says this 700-year-old tree has sacred and medicinal properties.

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

This tree has witnessed nearly 1,000 years of history.

Some believe this tree to be more than 1,500 years old.

This 800-year-old Rimu tree may be the oldest of its kind in the world.

At an estimated 3,800 years old, this olive tree is one of the oldest on earth.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

A rather vulgar example of the transition from Latin to the Italian vernacular.

A Nesting Doll of Churches.

This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Saint Borromeo often prayed in this austere crypt during the 16th century.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

The ruins in this village were caused by something more sinister than neglect.

Even though bison are not native to this Danish island, you might find them walking around the Almindingen Forestas as part of a nature experiment.

One of London’s rare Tudor-era buildings is a fate-defying gatehouse for a church.

A ghostly mansion in the middle of downtown Tunis.