A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

The corpse bride of Portugal.

A deer-headed statue that brings together a 12th-century legend and big wave surfing.

This castle has links to Portugal’s founding and struggles for independence.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

This lifelike sculpture of a policeman serves as a helpful reminder to watch out for crossing pedestrians.

Every drop of D.C. tap water flows through this old waterworks.

The span is crooked and made from two older recycled bridges.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

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

These unusual rooms on wheels are holdovers from the 1960s.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

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

One of the oldest standing structures in Montgomery County, Maryland.

This giant 200-year-old ginkgo is one of the largest in the United States.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

An Industrial Revolution-era public work that purified water using nothing but sand.

The towering figures were created from the cemetery's fallen old-growth trees.

This grisly headstone doesn’t seem to be resting in peace.