A pocket of serenity in hectic Buenos Aires, complete with a peaceful courtyard and massive library.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

A gateway to a mysterious network of underground tunnels.

The final resting place of the liberator of Argentina is guarded around the clock by two soldiers.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The first presidential bomb shelter was located in an old vault under the Treasury, connected to the White House via tunnel.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

A 13th century fortified house built to defend the Duchy of Burgundy.

A plaque on the base of this statue holds a bewitching design.

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

This museum is rotten with a century of wax medical deformities.

The hands on this clock appear to be created by two workers sweeping debris into careful positions.

A large replica of a monumental Roman inscription is located on the side of this museum.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

One of seven Jewish catacombs in Rome and one of only two open to the public.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

A forgotten "city of water" underneath the famous Trevi district.