Paranormal activity on the great lakes.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Unconventional site where the tracks of Zurich tramcars intersect.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Where Venice's gondolas go for a tune-up.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The only museum with its curator—and her pets—buried inside.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Go inside to really appreciate this 500-year-old technological masterpiece.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

A flooded Mexican cave that hides a river beneath the water.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

This splendid tomb may look fantastic, but there's nothing in it...

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

An exquisite Baroque church in Vienna's old town.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.