Perhaps the most spectacular grotto along the Algarve coastline.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Over 2,000 ancient temples dot the Myanmar landscape at the site of this famed archaeological site.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

A hip bar decorated with walls of golden skulls.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Read a book next to a Midtown waterfall.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

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

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

A lush indoor jungle fills this bustling Madrid transportation hub.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

A Moroccan getaway in the mountain range that plays the Himalayas' stunt double.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

An enormous, inside-out glass globe built in 1935.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."