For nearly 50 years this airplane that crashed during World War II remained missing in the remote Australian backcountry.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

This relatively recently abandoned brewery is a tragic reminder of the continuing effects of Hurricane Katrina.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

The best place in the world to buy tinned fish.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

A 1950s beatnik coffee house, turned 60s counterculture hotspot, turned modern music venue.

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

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

Despite its grandiose name, this enigmatic first-century void under the town is no cave, and it's possibly not a palace either.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

Blitzkrieg bop your way through Berlin's Ramones Museum.

When the rain falls, this drain system turns into a musical instrument.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

A beautifully eclectic mix of architectural styles.

This ghost town in Belgium will lose its street art when it ceases to exist.

This abandoned Belgian fortress is purposefully being left to nature.