One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

Five candy-colored villages on the Italian Riviera.

Founded in 670, this ancient mosque is an architectural time portal.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Frida Kahlo's childhood home, now a museum of her life and works.

An important Mayan religious and trading center dating back to 200 BC.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

A massive underwater sinkhole made famous by Jacques Cousteau.

Spanning over 10,000 square miles, this ancient salt pan is one of the largest on the planet.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

This one-time health resort was used by aristocrats around the world.

A relic from the Industrial Revolution got a second life as a contemporary performing arts space.

A whimsical bridge adorned with decorative dragons.

This abandoned Slovenian military barracks has become a punky-political art squat.

The Slovenian architect designed many landmarks in the capital city, including his own dream house.

Tiny castle in the middle of the Rhine made you pay to pass.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

Yup, that's a 330-foot yacht passing over the highway.

This functional solar system model was inspired by the famous Eisinga Planetarium.