The use of plants & plant extracts to maintain & improve health is called this type of medicine
Herbal
With tombs houses & buildings carved into the cliffs Petra in this country is a famous archaeological site
To alternate between 2 positions is to do this also a 6-letter playground apparatus
See-saw
The United Nations Archives in this Swiss city is also where you'll find the League of Nations Archives
Geneva
A bear abode
It's an obstacle we face in life & runners face on the track
Hurdle
Located on a slope of the Acropolis is one of Greece's oldest theaters dedicated to this god of wine
Dionysus
Using this breakfast food to mean to be indecisive dates back to the 1800s
Waffle
The Vatican Apostolic (formerly Secret) archives hold a 200' scroll recording the 14th century trial of these knights
The Knights Templar
A failure like a movie at the box office or a shell that doesn't explode
Dud
Playtex was once a big name in this women's undergarment that has mostly given way to shapewear
Girdle
One of the 7 Ancient Wonders was this huge marble tomb at Halicarnassus of which some fragments survive
The Mausoleum (of Halicarnassus)
It can mean a rubber sandal or to reverse your decision
Flip-flop
The National Library of Israel has an archive on this unjustly accused French officer including his marriage contract
Dreyfus
A cutting or insulting remark
It's the little furry critter seen here

A gerbil
Look out below! It's this Neolithic monument as seen from above

Stonehenge
The "still undecided" are this, also the title of a movie in which George Clooney has millions of frequent flyer miles
Up in the air
The US National Archives has an often-reproduced 1823 version of this document made when the original was already fading
The Declaration of Independence
Turn down the lights
Dim
According to Euclid, a _____ is a "plane figure bounded by one curved line, and such that all straight lines drawn from a certain point within it to the bounding line, are equal. The bounding line is called its circumference and the point, its centre."
A circle
A gift from Egypt the obelisk on Paris's Place de la Concorde once marked the entrance to this temple in Thebes -- not Vegas
Luxor
This adjective for your mixed feelings comes from Latin for "both" and "vigour"
Ambivalent
The Vassiliev Notebooks of information from Soviet archives show that yes this NYC-born man executed in 1953 was an atom spy
Rosenberg
A turned-up noise
Din