Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

The final resting place of the liberator of Argentina is guarded around the clock by two soldiers.

A pocket of serenity in hectic Buenos Aires, complete with a peaceful courtyard and massive library.

This Costa Rican chapel is the most metal church in the world, literally.

This Costa Rican topiary park is a surreal garden of unearthly delights.

Hear the quietest sound from across the dome.

On the eve of a condemned prisoner's death, this bell rang 12 times outside their cell.

Public access to clean drinking water was an instant hit among the masses.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

London's amazing modernist public square that never was.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

A mysterious shape catches the eye in this 16th-century painting.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Created by one of England's most prolific labyrinth designers, inspired by Bath city history.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.