While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

A stunning Victorian abbey and walled garden on a lakefront.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

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

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Portugal's National Pantheon has a history of curses, collapses and financial problems.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A unique underground structure dating back to the 1st century BC.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Historic medieval fortified city in southwest France.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Its floors are marked by colorful cues depicting Michigan's native fauna.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

Everyone's invited to put on a miniature concert with this world-class musical wonder.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

Astounding collection of coin-operated games and automata.

What was once the largest NFL stadium.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.