When Azorean green tea meets volcanic hot springs water, a luminous brew is born.

Get buzzed beholding one of the world's largest coffee-machine collections, then step into the café for a specially brewed cup.

Science fiction's grandfather has a fittingly marvelous tomb.

An ancient ossuary in Rouen.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

A small museum of antique transport that's a must-see for bicycle lovers.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

A Gothic cathedral created from volcanic rocks.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

The world's tallest bridge is also possibly the most elegant.

The world's most famous cheese caves.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

This hospital helped pave the way for treatment that drove down child-mortality rates in 19th and 20th centuries.

The collection contains over 25,000 items and details the painful dental practices of the past.

Three small rooms at the back of the “official” church of London's clowns.

A little slice of Japan and its aesthetics in London's Holland Park.

London's old-school healing garden.

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

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

The oldest public library in Ireland.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.