Bohol's mysterious brown hills.

A patch of Philippines forest devoted to saving the lives of an emotionally sensitive species of googly-eyed primates.

Five miles of underground river link lake to ocean.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

The first religious structure on the island of Luzon and a survivor of World War II.

These tiered rice paddies were carved into the hillsides 2,000 years ago.

Hundreds of wooden coffins dangle from cliffs and caves in the Philippines.

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

The modern birthplace of Irish freedom.

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

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

This Neolithic passage tomb forms part of a World Heritage Site.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The atmospheric road was never meant to be so creepy.

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

These murals stand as reminders to the troubled history of this Northern Ireland city.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.