The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

A 115-year-old restored German dining hall awaits those who venture beneath the Minnesota State Capitol.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.

The Arctic Archipelago is home to world's largest third order island: an island in a lake on an island in a lake on an island.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

More gold than anywhere else, ever.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

Tragic reminders of the 1945 firebombing campaign over Tokyo still haunt this bridge.

An outcropping plays host to the largest collection of pre-contact petroglyphs in Saskatchewan.

San Francisco's first World's Fair, dedicated to the wonders of California.

A huge musical instrument played by the ocean.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A palace-fortress ruin in Indonesia complete with legends of two magical tigers, eight bathing angels, and a wish-granting cannon.

Ninety years of Sydney buses under one roof.

Cockatoo Island is a Heritage-listed island in the middle of Sydney Harbour.

Taxidermy of the racing horse with a huge heart, who inspired hope in the Depression.

An abandoned jewel of a ballroom on the top floor of Australia’s busiest rail station echoes with the sounds of a bygone era.

Two provinces and two territories touch borders deep in the middle of the wilderness.

When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.

Someone left a Boeing 737 in a field in southern Bali.

It took 28 years to build this massive statue of the Hindu god Vishnu riding a mythical bird.

The wing of this deserted Boeing 737 almost touches the Dunkin' Donuts next door.