An abandoned concrete jungle surrounded by a lush park.

This massive railroad spike celebrates the 1939 premiere of the movie “Union Pacific.”

A brick-paved former section of the historic coast-to-coast highway.

One of the largest private collections of fossils in the world.

This sky-high radio mast is formerly the tallest man-made structure in the world.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

A once celebrated industrial wonder now lurks in a quiet corner of Flathead Lake.

Miraculous tree that seems to sprout out of solid rock.

Hike to the decaying remains of a dream house with a spectacular view.

The highest point in Texas is capped by a big silver pyramid.

Tijuana's legendary jai alai or "basque ball" palace is now a massive music venue.

What looks like a normal building is really a hollow facade hiding a subway vent.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

The former headquarters of history's oldest megacorporation.

Widely advertised as Amsterdam’s narrowest street, this passage was once a highlight of the Red Light District before its windows closed.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Europe's official "zero-level," the equator of elevation.

The smallest bar in Amsterdam has stayed in the family since 1798.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

A set of seven houses, each built in a style that represents a European country.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A floating cat sanctuary on an Amsterdam canal.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.