A solitary arbor with a unique pedigree.

This neighborhood was built in the golden age of Art-Decó, and its buildings are essential to understanding this style

This altarpiece isn't a gilded baroque work taken from a church, but rather a recreation where everything (even the fence and lock) are made of paper and cardboard.

These "antimonuments" confront the Mexican authorities by memorializing the most troubling events in the country's modern history.

It makes sense that this airport, serving one of Mexico's most artistic cities, also doubles as a gallery.

This great tree was gifted to Monterrey in 1996, the 400th anniversary of the city's foundation.

Coins, pottery and an underground wunderkammer featuring a fossil of the species named after the collector behind it all.

An ancient healing font dedicated to an 11th-century matriarch was moved to make way for progress.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A forgotten underground railway once whooshed trams beneath London.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

Putting the "mod" in "modular" since 2000.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

A living memorial to the trees London lost during the Great Storm of 1987.

A series of carved figures that scandalized British society.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.

Soon after its unveiling, this giant inverted globe sparked controversy and was vandalized.

A jumble of concrete on the corner of one of London’s terraced buildings is actually a work of art.

An inverted staircase above the entrance to the Bethnal Green Underground Station functions as a memorial for people who lost their lives during the worst civilian disaster in the U.K. during World War II.

The niches over the western entrance of Westminster Abbey honor individuals from the 20th century who gave their lives for their Christian beliefs.

Run by the same people as a subterranean art space, this pub does double-duty as a Cave of Wonders.

Take in the views of Big Ben with a Guinness in hand at this floating pub aboard a 1930s Dutch barge.