This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

Stunning wetlands ablaze with pink lotus flowers.

The largest self-built castle in the U.S., six decades in the making.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A silly medieval mural preserved on the side of a Viennese house.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

This 19th-century sugarcane plantation is one of the most well-preserved estates of its kind, including its original quarters for enslaved laborers.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

This harsh mountain path was built as a strange attempt to improve the health of Turkmen citizens.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.

This historic, one-acre island is the only legal place to camp in the city of Richmond.

Burke’s oldest cemetery also houses the victim of the county's grisliest murder.

One tiny triangular park commemorates the victims of a yellow fever epidemic—many of whom are buried right below the grass.

This labyrinthine resting place of Black American leaders has been reclaimed by nature.

A cement mixer-turned-kaleidoscope in downtown Norfolk offers different views of the city.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

Search for traces of the dinosaurs that roamed here more than 90 million years ago.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.