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

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Copenhagen's celebrated theme park and gardens.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

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

Sweden's oldest animated sign is still lighting up the skyline today.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

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

It houses the remains of a 17th-century version of the Titanic.

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

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Metro station with a claim to rock n' roll fame.

A restaurant and observation deck built in a unique broadcasting antenna.

Calcium-rich water has turned the water and rocks of these Philippines falls slightly green.

Five miles of underground river link lake to ocean.

Hundreds of Buddhas in a re-discovered Indonesian temple.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

Subterranean place of worship in Indonesia.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

Malaysia's first and only glass temple.

Built by the Portuguese colonists in the early 16th century, this fort is one of the oldest European structure in Asia.

Cartoon clouds and nature-inspired murals have transformed the streets of Kuala Lumpur.

One of the world's tallest flagpoles.

This statue of an eagle taking flight welcomes visitors to Langkawi.