Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

One man's homage to the sun continues to grow like a glass fractal.

America's most famous piece of self-built architecture.

The legendary building that needed ghostly approval before being built.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A basement full of treasures lies beneath this inn that has worn many hats throughout its 140+ years.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

A performance hall at the American Jewish University moonlights as a sci-fi film location set.

From Japan to Italy, this California park explores the world's cultures through their gardens.

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

A sacred well steeped in Pagan roots on the West Coast of Ireland.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

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

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

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

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.