The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

This giant wooden treehouse within a sprawling garden has its own eatery.

Lavish royal estate punctuated with heated greenhouses.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

Rare karst landscape eroded from a flat seabed.

Stunning Roman aqueduct used for 1900 years and still standing.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

A spectacular walk on the flank of a gorge.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Eighty million natural history specimens call this gargantuan museum home.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

This elegant arc of a waterfall marks a religious turning point.

The most powerful waterfall in all of Europe.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.