Ever-changing museum dedicated to graffiti and contemporary street art.

Antique frame collection with 2,400 frames.

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

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

Documenting the nationalist movement in Northern Ireland, with an emphasis on the history of political prisoners.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

These barriers stand as stark reminders of Northern Ireland's troubled past.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

A historic Georgian building and warm springs.

This landmark Victorian folly rewards visitors with spectacular views over the Peak District.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

6000-year-old site covered in more than 50 megaliths.

These quintessentially English stepping stones were built for Victorian tourists.