A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The "lovely red Vega" of the legendary record-settling pilot.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

People escaping slavery may have hidden inside a corpse vault.

Home to items never before seen by the public.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

A contemporary fresco movement illustrates the region's rich history.

A Roman spa buried deep beneath the City of London.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

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

Repository for more than 22 million pickled specimens.

The television series' iconic giant foot was borrowed from this classical painting.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

An incarceration museum on the spot of possibly the oldest prison in England.

The anatomical-pathological collection of a man who changed surgery.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

An unusual round church in London with a Templar past.

Rebuilt remains of a temple to Roman god Mithras.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.