A moody and picturesque riverside ruin overgrown with vegetation.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

The house where the writer spent his formative years.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

The modern birthplace of Irish freedom.

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

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

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

In one of the world's smallest countries, a royal's personal winery is open to the public.

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.

One of the highest emergency huts in the world has been waiting almost a century to give imperiled climbers a place to lie down.

Spiral alpine structure provides an alternative experience of viewing the Matterhorn.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

Lucerne's central prison was converted into a tourist hotel with a bare minimum of changes.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Modern sundial uses ancient methods to tell time and date perfectly.

A stunning Victorian abbey and walled garden on a lakefront.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

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

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