A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

A painfully obvious spy house sits right across the street from the Russian Embassy.

A wondrous old library overlooking the nation's capital.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

Britain's only herd of free-ranging reindeer.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

Remnants of a storybook amusement park hidden behind a strip mall.

A remote horde of architectural treasures fit for Indiana Jones.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

This suburban house is made of dirt, and almost sparked a revolution in home construction.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

Brain collection and database that narrows the gap between man and animal.

An astounding collection of medical specimens, including bits of President Lincoln.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

America's first federal monument.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The narrowest house in America is seven feet of pure spite.