Perhaps the most spectacular grotto along the Algarve coastline.

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

Elaborate tile work in this railway station tells the story of Portugal.

A museum dedicated to the history and exploration of both popular music and science fiction.

This small, but beautiful waterfall has attracted visits from artists, composers, and two United States presidents.

A fitting attraction for the corn capital of the world.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The real-life site of Ichabod Crane's infamous gourd attack.

Step inside Lucy, the world's largest "elephant."

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

Tiny memorials honor individual victims of the Holocaust.

The most visited, and possibly most controversial, museum in Germany.

The original burial place of this preeminent 18th-century Jewish philosopher was razed by the Nazis.

A brush maker used his factory to protect blind Jews from the Gestapo.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

An iconic view point of the Sea of Galilee offers a look into Israel's past.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

The most peaceful "country" in the Middle East.

Tel Aviv's popular neighborhood went though endless waves of transformation.

The only quarter of the Old City not dedicated to a major world religion.

After over 100 years out of service this landmark windmill once again turns as a symbol of Jerusalem's self-sufficiency.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.