The ancient tomb acts as a calendar that keeps perfect time.

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

This 5,300-year-old tomb with mysterious carvings crowns an Irish mountain.

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

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

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

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

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

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

The modern birthplace of Irish freedom.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Fragments of a massive unfinished sculpture sit near the main quad of the University of Illinois.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

This former Union fort commands a fine view of downtown Cape Girardeau and the Mississippi River.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

In the loving memory of a tragically deceased role-player this Illinois park is decked out with both dungeons and dragons.

One person's lost luggage is another person's treasure.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

A fascinating aviation museum where you can chat with the veterans who once flew the aircraft on display.