Dedicated to the neverending mathematical constant, this plaque next to a park bench was sponsored by an anonymous benefactor.

Its columns were all carved from the same white oak tree.

One of few vertical lava tubes in the world accessible by foot.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This small museum explores Mexican history and culture through clothing.

This freshwater spring fills with 10,000 gallons of water per minute.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

One of the last active volcanoes on the Eastern seaboard.

Some of the best pastries in "the Czech heritage capital of Texas" come from a gas station off I-35.

This bakery sells traditional Māori sourdough.

A touching tribute to the "Queen of Soul."

Get a taste of Chamorro cuisine, family-style, at this popular restaurant.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

One man's unrequited love stands in a glass box forever.

This mausoleum is the final resting place of one of St. Louis's richest and most tragic families.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

The solitary grave of a schooner captain killed by lightning while serving biscuits.

A rare and unique example of an 18th-century door latch calls this restaurant home.

This museum located in Fondi is also said to be the most haunted building in town.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

One of the last socialist halls still standing in the United States.

A beautiful opera house in the heart of Amazonia has recently restarted performances after a 90-year hiatus.

A sad reminder of the World War II bombing stands largely unnoticed on a street corner.