One of the world's oldest and most massive living organisms is a grove of quaking aspens.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Hidden beneath the streets of London is a secret subway that only carried mail.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

Ukraine's oldest operating pharmacy now offers guests a fascinating walk through apothecary history.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

An Irish Memorial commemorating those who perished due to potato blight.

A retired military stronghold on the rolling green coast of Donegal.

One of Ireland's most infamous prisons for rebels including men, women and children.

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

The mystery of this small, brick pond eluded its possibly only investigator until his death.

The oldest working mechanical clock in the world.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

This massive boulder is either a unique rock formation created by glacial melt or a magic energy vortex.

An 1814 castle that hosts an exhibit of "explorabilia".

A historic house devoted to the teachings of a 1700's prophetess and her mysterious box of revelations.

An ancient neolithic tomb that only sees the sun twice a year.

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

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

Beasts and branches swirl in sandstone carvings, interrupted by one strange creature.