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

The supreme shrine of the state.

Home to more than 13,000 pieces of war memorabilia and military equipment.

A chilling monument to Korean patriots who resisted the Japanese occupation.

The Hveragerði fissure runs through this unassuming shopping center.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

Walk in the footsteps of the gods and straddle two tectonic plates.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

This quiet bird sanctuary on the Danish coast is home to something not usually found in a conservation area: hunters' cabins.

This makeshift concrete bunker is an unusual reminder of the Cold War.

The world's biggest version of the popular Swedish souvenir.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

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

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

Stockholm's narrowest alley is barely over two feet wide.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.