The world's largest wooden structure.

Perhaps the most spectacular grotto along the Algarve coastline.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Where Saint-Martin ends and Sint Maarten begins (or vice versa).

A roundabout in the West Indies that pays tribute to a bus driver who brokered no-nonsense on the school route.

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

A park where people have been going to feed friendly pigeons since the 18th century

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

The world's largest anatomically accurate brain sculpture.

The large rock formation where the Shawnee prophet Tenskwatawa stood and encouraged his warriors during the Battle of Tippecanoe.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

This striking art museum holds an amazing series of curiosity cabinets.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

A unique botanical garden housed in three giant geodesic domes.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

This unique zoo is the only place in the world where you can see all 15 species of crane.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

This cave holds a surprisingly colorful variety of geological oddities.

Prolific outsider artist Sid Boyum's concrete sculptures add whimsy to Madison's Schenk-Atwood neighborhood.

Prayers and messages of hope decorate the ceramic tiles of this pavilion.