It depends on how much time people have, but I would always recommend travelling to Yazd - it's one of the oldest cities in the world and we say it was the first to have air-conditioning, because all of the ancient houses were built with towers to catch the wind.
Block's proposal for a "radar wall" is actually just what DHS has in mind: Last month, the agency was given the green light to build out a virtual fence along the southern border, a series of sensor-and-camera-equipped towers to catch unlawful movement just north of the Mexican-American border.
Our first, 500-mile drive south through the rolling desert took us to the oasis city of Yazd, with its unique skyline of tall wind towers, designed to catch any faint breaths of breeze and funnel them down into secret retreats at the heart of the huddle of mud-brick houses.
The installation, Blood Swept Lands and Seas of Red, drew crowds of 4 to 5 million, with people standing six deep around the tower's moat to catch a glimpse of the display in its final weeks.
A more sinister motto warns: "Duélete carnero, que hay fiesta en el pueblo" (You'll be sorry, billy goat, there's a fiesta in town), although it is now 10 years since the residents of Manganeses de la Polvorosa stopped the practice of hurling a live goat from the church tower to be caught (if it was lucky) in a blanket.
They're badgirs, wind towers cunningly designed to catch a passing breeze and funnel it down over a pool of water in the house to provide a surprisingly effective form of natural air-conditioning.
Once you have booked your hotel/apartment, then, using your maps, figure out how to get from the airport to your hotel/apartment, from your hotel to the Eiffel Tower, from your hotel to catch a bus tour of Paris, and/or from your hotel to the Louvre, for example.
Worry not, visitors to Hong Kong will not have to sneak past security guards at the tall office towers surrounding the walkway to catch a glimpse of it.
Lift your eyes skyward to spot the Montparnasse Tower and the Eiffel Tower or, my preference, look down at the streets to catch passing glimpses of everyday Paris life and buildings.
