Places meltingknight Wants to Go

Part of one of the largest flooded cavities on the planet, and littered with prehistoric animal bones.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

Striking ruins of a mansion that stood center stage in one of modern Brazil's most puzzling crimes.

This mesmerizing statue of a child wrestling an anteater symbolizes the native culture and biodiversity of São Paulo.

Pigduck of Turku.

The etchings on this narrow channel between two islands bear witness to maritime travelers who have passed through since the Middle Ages.

These Finnish rapids have been attracting tourists for over a hundred years and are now released with the push of a button.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

An abstract monument to a symphonic composer.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

An alien church provides much needed silence in the midst of a Finland shopping center.

Legend has this precariously placed rock was placed by giants. Science has another explanation.

A subterranean house of worship carved right out of the bedrock.

This fantastical icy castle is built anew every winter.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Villas that once served as playgrounds for the rich now fall away in decay.

Wheels of chrome by the thousands adorn this California Historical Landmark.

A rim-made reptile in North Dakota.

The world's tallest turtle riding the world's largest snowmobile.

A little-known park with unusual, half-ruined structures and a mystical energy.

Super-heavy Nazi architectural experiment.

Berlin's old airport.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.