A series of playful yellow penguins share a serious message about the environment.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

Ruins of a German Castle on top of a towering stone pillar.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

A 16th-century Andalusian palace.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This castle has links to Portugal’s founding and struggles for independence.

A submerged village appears when dam levels drop.

One of the largest Roman settlements in Portugal.

The "Little Ones," show Portugal in full miniature splendor.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.