Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

This one-window stand has been home to a giant vat of slowly simmering meats and an array of unique tacos for almost 50 years.

This extraordinary art museum is like a secret world on the edge of Mexico City.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

This French cemetery houses some of the most exquisite examples of funerary art in Mexico City.

At a museum of everyday objects, it is the act of collecting that is really on display.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

The world’s only museum dedicated to baked beans.

One of the world's oldest trees comes with a Welsh legend intertwining it with a spirit prophesying death.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

Here, exhibits come with a side of edible history.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

In this century-old literary safehouse, print is alive and well.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

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

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A winding path built in secret on the edge of the continent.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

A 140-year-old castle with underground caves hidden in San Francisco.

Perhaps the most spectacular grotto along the Algarve coastline.