On the Oregon coast there is a natural hole that seems to be draining the sea.

Only known mainland rookery of the threatened Stellar sea lion.

The longest continuous lava tube in Oregon.

One of the world's last well-maintained airship hangars.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

An art museum with an eclectic design and a scandalous past.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This tiny museum's sizable collection is jammed into a former underground public toilet.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

The place to be if you love vintage Swedish cars.

Stockholm's tiniest statue is of a small boy looking at the Moon.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

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

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

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

Bring your hiking shoes, wool socks, and thermal underwear for a stay in these cozy forest huts.

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

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

The home of aviation trailblazers, in a remote corner of the big city.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

Now the site of a high school, this was almost the location of the largest cathedral in the US.