The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

This unique sanctuary invites you to interact with the beautiful birds.

This little blue house pokes out over the campus of UC San Diego, seven stories high.

The smallest Mexican land grant in California was given, and then taken from, a 19th-century teacher and nurse.

A couple turned their front yard into an artistic masterpiece.

The oldest standing structure in downtown San Diego.

137 graves holding New England's earliest residents.

One of the world's oldest trees comes with a Welsh legend intertwining it with a spirit prophesying death.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

The stately remains of Llywelyn the Great's mighty fortress.

Picturesque ruins once held off mighty armies.

At the United Kingdom's only residential library you can sleep among the books.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

A stunning hermit's shrine on a steep rocky spur in Northern Italy.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.