One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

This fountain was designed to honor the man who helped bring water to Barcelona.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

A 16th-century Andalusian palace.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Slyly buy a shake in the Parker Meridien lobby.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A very classy 1920s-era bar right in Grand Central Station.

The artist and New York City icon lived, worked and died in this converted carriage house owned by another iconic artist, Andy Warhol.

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

Possible relics of the ancient Roman city are hidden in this restaurant's façade.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

Three hundred years of preserved Spanish colonial history in San Antonio.

The 40-foot-tall votive candle is the largest of its kind.

Drink wine handed out through a window as part of an age-old tradition.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.