The point where New South Wales meets Queensland and South Australia.

Stand at the point where the two mightiest rivers in the United States converge.

A volcanic core jutting above the plain between the Snake and Boise Rivers, a marker identifies the reference point for all U.S. Government Surveys in Idaho.

The last remaining 19th-century mile marker along the historic Ocean Parkway.

An iron monument on the 120th meridian as surveyed, one of only four marking the boundary between Nevada and California north of Lake Tahoe.

This stone in Lake Geneva was once the reference point used to determine altitude in Switzerland.

A Google software engineer's Easter egg led to what may be the world's most unusual saved screenshot.

Ireland's most northerly island is hauntingly beautiful. Its lighthouse was the last glimpse of home for many Irish emigrants bound for the U.S.

In this German city center, the streets have no names.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

A futuristic rocket marks the spot where three borders meet.

The last original stone marking the interwar border between Germany and Poland sits in this unassuming village park.

The "Key of Keys" for Washington, D.C. and the apocryphal landing place for the military campaign that started George Washington's career is now at the bottom of a well.

The United States' first transcontinental automobile road came to its end at this spot in San Francisco's Lincoln Park.

One in a series of historical markers from the massive 19th-century undertaking to map all of India.

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

Designed to mark the geographical center of France.

Once used to calculate the various levels around the country.