An intimate look into the apartments of Jounieh via cable car.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

The walls of the iconic dome are hollow and have a secret stairway.

Largest Roman Catholic church in North America.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

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

Underground tunnels once home to crime are now back open to the public.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This two-room factory has been cranking out the musical signifier of zaniness for a century.

A much-maligned monument to teetotalism.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Venice's island of the dead.

Go inside to really appreciate this 500-year-old technological masterpiece.

The land is home to swimming ponies and a legendary 18th-century treasure.

Introducing the Green Fairy to her fawning masses.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Rome's semi-secret peephole vista is also a former Crusader stronghold.