Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

The painter of "The Scream" is laid to rest under a stoic bust of himself in the humble corner of an Oslo cemetery.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Home to three historic ships from the age of Vikings.

The library's graceful rotunda is like a bibliophile's temple.

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

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

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

Unfortunately, you can no longer spend a night in this single-person treetop hotel.

A floating underwater hotel, created by a Swedish artist.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

This star-shaped artillery fort protected the mouth of the Thames from the 16th century to the Second World War.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

The remains of the great moral philosopher reside in a university in London.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

This large torch on the Hove coastline helped Sir Francis Drake defend England from the Spanish fleet.

An unassuming churchyard is the resting place of a pioneering surveyor and reluctant namesake of a mountain.