Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

Started as a kitchen garden, now the second largest botanical garden in the world.

Every inch of this chapel is covered in craftsmanship from across the world.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

A once-secret library of Freemason history in Catalonia.

This Funeral Hearse Museum represents the finest in cadaver transportation.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

One of the smallest bookstores on the planet.

A garden in Lisbon filled with giant porcelain creatures.

The world's oldest bookshop still in operation.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

These morbid carvings remind churchgoers of the inevitability of death.