From A QUESTION OF HONOR:
White's Club, St. James's Street, London. The famous bow window is visible (center, bottom), but the present facade dates from 1852.

Buckingham Palace, with Green Park (site of the duel in QUESTION OF HONOR) in the distant background (top right).

The cliffs near Dover.

From THE EXILES:
Demel's pastry shop, open continuously since 1785, appears in the book under its earlier name, Dehn's Confectionery. This was one of my favorite research stops in Vienna.

Schönbrunn Palace, summer home of the Austrian imperial family.

Baden, the spa town just outside Vienna where Elizabeth is taken to recover after the assassination attempt.

From THE SPY'S BRIDE:
Bevis Marks synagogue in London. Dating to 1701, it is rumored to have been designed by Wren.

The Château de Vincennes, just east of Paris, where James is held prisoner.

From THE SPY'S KISS:
Chantilly, home of Julien Clermont's family in France. Adjoining the chateau (largely rebuilt after the revolution) is the fascinating Living Horse Museum (Musée Vivant du Cheval), housed in the palatial 18th-century stables built by the Duc de Bourbon. The Museum offers live equestrian demonstrations, and my hippophilic teenager insisted that we go. It was wonderful--highly recommended for any horse fan.

From THE SPY'S REWARD
Rugged mountain terrain traversed by Napoleon (and by the hero and heroine) after his escape from Elba. Also traversed by me, at the same time of year (early March). It was very, very cold--I was quite grateful to be in a car instead of on a mule or a horse.

Napoleon's escape from Elba is a legend in France, and every place where he slept, ate, or even stopped for a rest en route is marked with a plaque.