No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Be(w)ar(e) the moat around this historic Czech castle.

A surreal statue honoring Prague's favorite literary son.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

Breathtaking and huge 430 year old maps of Italy.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

This World War II relic let Allied pilots know they were entering neutral airspace.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

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

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

A stunning Victorian abbey and walled garden on a lakefront.

The modern birthplace of Irish freedom.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

A hugely vast Irish landscape of barren rock that stretches for miles.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

Experience what life was like in Ireland during the Viking and medieval ages.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

This single room has survived the centuries with almost no deterioration.