A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

Paris' linguistic guide to the international language of, yes, love.

A museum of carnival attractions where you are invited to ride the rides.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This South London cemetery holds the remains of more than 15,000 people.

The fairy tale castle of the "fairy-tale king."

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

Crop circles inspired this whimsical garden in Germany.

A German apartment building hosting as many trees as human occupants.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

Breathtaking Byzantine paintings cover the inside of this 12th-century church.

A geological oddity topped with a 2,000-year-old pagan temple.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.