This former coal gasification plant found a curious second life as a popular public park.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

Built over an abandoned train yard, this hidden gem is full of winding paths and offers gorgeous views of Sydney Harbour.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Every Sunday, this Thai temple in Berkeley serves a backyard brunch.

A boardwalk winds through this sliver of coastal nature hidden within Sydney.

A self-funded cemetery with a long list of inhabitants.

Native Australian lizards inhabit this garden celebrating Sydney and its sister city in China.

Come for the flowers, stay for the bats!

These flying foxes dangle from the trees around the library like fuzzy black fruit.

The ruins of New Zealand's largest classical-style church.

This aluminum “stairway to heaven” has impaled at least a couple of birds.

This forgotten beach house built to look like a Frank Lloyd Wright masterpiece overlooks a hidden beach.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

The Swedish flag over this small naval fort signals that the nation is at peace.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's deepest subway station is also a stunning ecological wonder.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Sweden's "good old days" painstakingly re-created in a model village.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The only surviving piece of Copenhagen's 16th-century defensive wall.