Every year, over 25,000 monarchs overwinter in Pacific Grove.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Canyon walls shrouded in ferns.

Picturesque ruins once held off mighty armies.

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

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

A modest stone circle in North Wales.

Three bridges straddle a stream, one stacked upon the other.

One family's environment-friendly hobbit-house in Wales.

One woman's Viking Castle on Lake Tahoe.