One of the oldest and certainly best preserved Cistercian abbeys still in existence.

Personal garden filled with mosaics made of recycled garbage.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

This massive library holds what was once the largest book collection in the world.

The Avenue of Mausolea is a series of grand palatial tombs.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

Reputedly based on the tomb of Jesus Christ, this crypt is the oldest surviving structure of any cathedral in England.

Oxford University's stateliest library seems designed to make students truly feel the weight of knowledge.

One of Europe's oldest libraries.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

The “Sistine Chapel” of the Middle Ages merges 11th-century science and religion in wondrous hues.

Physicist’s epitaph provides final confirmation to a career of turmoil.

The final resting place for the remains of 143 Habsburg royalty.

The beautiful baroque library of the Hapsburg empire.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

The most loyal of little dogs, or a Victorian era publicity stunt?

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

This sublime architectural marvel is a rare example of an expressionist church.