A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

Devilish masks, handicrafts, and pieces of old buildings create a snapshot of life in a historic Alpine region.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

Two nearly identical Chinese pagodas stand side by side, along with ancient stone relics.

This ancient sword lay in a waterlogged tomb for 2,500 years, but managed to remain relatively untarnished and impressively sharp.

In Northeastern Iceland lies something of an oxymoron: a steaming desert.

This stunning concert hall has become a symbol of Iceland's national recovery.

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

An important pilgrimage site for pagans and early Christians, named for a Celtic goddess-turned-saint.

Petrified footprints of one of the very first vertebrates to walk on land.

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

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

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

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

The embalmed remains of the communist leader lie within a custom crystal coffin.

This ratty natural history collection is a charming relic among a city rushing into modernity.

China's most famous acrobatics act.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

The bright red stripes streaking across the rocks are the star feature at this Icelandic waterfall.