A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

The second-largest giant sequoia in the world.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

This mysterious tower is said to enshrine a dormant seven-headed serpent that once protected Vientiane from destruction.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

The arching stretch of London's longest street holds many reminders of the area's maritime past.

Down a pint of ale where the Bishop of Ely's servants slept in 1546.

This iconic high-rise residential block was one of the last to be built in the Brutalist style.

This medieval church tower has maintained its clockworks since the 16th century.

This ancient Egyptian obelisk still bears the wounds of World War I.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

The taxidermied remains of a once-great parrot.

A quiet memorial to those who died saving others in the heart of the City of London.

The commemorative stone column conceals a secret laboratory.

The fences outside some of South London's estates are made from recycled World War II stretchers.

The Tudor-style cottage in the middle of the square is not quite what it seems.

An architectural oddity hides in plain sight on this iconic London bridge.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

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

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

The cedar tree in Highgate Cemetery earned its title by accident.

Where condemned pirates met their grisly end at the gallows on the River Thames.

Dictionary Johnson’s favorite feline.