The old observatory in Copenhagen has a spiral corridor used as a racetrack.

This sublime architectural marvel is a rare example of an expressionist church.

Copenhagen's celebrated theme park and gardens.

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

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

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

One of Amsterdam's narrowest houses is located right across the canal from its widest.

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

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

This sheep farm has been forever transformed since being built for “The Hobbit” film series.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

The platform atop this verdant volcano was built with the help of a royal elephant.

This public art is inspired by a local Aboriginal creation story.

This 4.5-meter-tall statue of a native Australian bird marks Hydro Aluminium's 40th year in the area.

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

A statue of a Scottish cultural icon in central Sydney.

A 19th-century perch for spotting sailing ships now boasts one of the most iconic views in the Southern Hemisphere.

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

This rare effigy of the author spent years lost in storage.

The statue honors an adventurous seafaring cat.

Clean, cold drinking water flows from a nondescript pipe in a roadside rock face.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.